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Hypotonia (Low Muscle Tone)

Hypotonia means low muscle tone — a baby or child who feels “floppy”. It is a sign that something is affecting the brain, nerves or muscles, not a diagnosis on its own. Finding the cause matters, because some causes have effective treatments and therapy can start right away.

A baby who suddenly becomes floppy needs emergency care. Call 911 or go to the emergency room if a baby or young child suddenly turns limp or floppy, is very sleepy or hard to wake, stops feeding, or has trouble breathing. These can be signs of serious illness such as meningitis (NHS) or sepsis, where breathing may be very fast or difficult, with grunting or the tummy sucking in under the ribs (NHS).

Infant botulism is another cause. In babies it can cause constipation, poor feeding, drooping eyelids, a face with less expression and a weak cry that sounds different (CDC), as well as a limp or floppy head, neck, arms or legs (NHS). All kinds of botulism are medical emergencies; CDC says to see a doctor or go to the emergency room right away and not to wait (CDC). Never give honey to a baby under 12 months (NHS, MedlinePlus).

If your child already has hypotonia, get prompt medical help for new trouble swallowing, coughing or choking with feeds, or any breathing difficulty. Weak muscles can affect swallowing and breathing in conditions such as spinal muscular atrophy (NINDS), and in congenital myasthenic syndromes, fever or infection can trigger episodes of severe weakness or breathing problems (MedlinePlus Genetics). Ask your child’s team for a written plan for illness and breathing problems.

What is hypotonia?

Hypotonia is the medical term for decreased muscle tone. It can happen when the brain, spinal cord, nerves or muscles are damaged (NINDS). Healthy muscles always keep a very small amount of contraction, even at rest, which gives them a springy feel and some resistance when someone else moves the arm or leg. Hypotonia is not the same as weakness, although the two can happen together (NINDS, archived).

Most important, hypotonia is a sign, not a diagnosis. It is seen in conditions as different as Down syndrome, muscular dystrophy and cerebral palsy, and sometimes no cause can be found (NINDS, archived). Finding the cause can be hard, but it matters: it shapes the outlook, related health problems and the chance of it happening again in a family (Sparks, Clinics in Perinatology, 2015). Low tone on its own does not affect intelligence (NINDS, archived), although some of its causes do.

The “floppy infant”

Babies with hypotonia can have a floppy, “rag doll” quality: their arms and legs hang by their sides and they have little or no head control (NINDS, archived). Doctors may notice a “frog-leg” posture from low tone and few movements (Morton et al., JAMA Neurology, 2022), and parents may notice that the head lags when the baby is picked up from lying on the back (NINDS). Some floppy babies also have trouble sucking and feeding, or with breathing (NINDS, archived, NICHD).

Brain (central) causes and nerve-and-muscle (peripheral) causes

Doctors first look for common secondary causes, such as low blood sugar, heart disease or a serious infection (sepsis). If none is found, they consider primary causes, which fall into two groups (Morton et al., 2022):

  • Central hypotonia starts in the brain or spinal cord and accounts for about 60 to 80 percent of primary hypotonia in newborns. Genetic examples include Down syndrome, Prader-Willi syndrome and inherited metabolic conditions; non-genetic examples include brain injury from lack of oxygen, infection, bleeding in the brain and injury (Morton et al., 2022).
  • Peripheral hypotonia comes from the motor nerve cells in the spinal cord, the nerves, the junction where nerves meet muscle, or the muscles themselves, and accounts for about 15 to 30 percent. These babies often have hypotonia as their first sign, along with weak or absent reflexes and marked weakness (Morton et al., 2022). Many of these neuromuscular disorders are genetic (MedlinePlus).

Some conditions that cause hypotonia

If your child has developmental delays, our Developmental Disabilities guide covers services and rights; see also our Angelman Syndrome and Autism guides. Spina Bifida and Smith-Magenis Syndrome guides are on the way.

Signs at different ages

CDC’s “Learn the Signs. Act Early.” milestones describe what most babies can do by each age. Missing movement milestones like these is a reason to talk with the doctor:

At any age, low tone can bring problems with movement and posture, breathing and speech difficulties, loose ligaments and joints, and weak reflexes (NINDS, archived). Children with significant, ongoing hypotonia are also at higher risk of hip problems that standard newborn checks may miss (Livingstone et al., Dev Med Child Neurol, 2025). A child who keeps losing movement skills needs prompt evaluation: steady loss of skills may point to a genetic or muscle disease, a metabolic disorder or a tumor rather than CP (NINDS).

How doctors find the cause

Evaluation usually starts with a neurologist checking movement and sensation, balance and coordination, mental status, reflexes and nerve function. Tests may include a CT or MRI scan of the brain, an EMG of nerve and muscle function, or an EEG of brain activity (NINDS, archived).

  • Genetic testing looks for changes in genes and chromosomes; genome or exome sequencing checks all or the protein-making parts of a person’s DNA (MedlinePlus). An international group of newborn specialists recommends rapid genome or exome sequencing as a first test for babies in intensive care with unexplained hypotonia; it found a diagnosis in more than half and often changed care (Morton et al., 2022). For SMA, a blood test for changes in the SMN1 gene finds at least 95 percent of types 1 to 3 (NINDS).
  • Blood tests can show muscle injury: a raised creatine phosphokinase (CK) level is typical of congenital muscular dystrophy (Morton et al., 2022).
  • EMG and nerve conduction studies help tell whether symptoms come from a muscle or a nerve problem; the needle can cause brief discomfort and some soreness (MedlinePlus).
  • Muscle biopsy, removing a small piece of muscle, may be used when gene testing for SMA is normal, to look for other conditions (NINDS). Fast genetic results can spare some babies invasive tests such as EMG and biopsy (Morton et al., 2022).

Hypotonia can be lifelong, but in some children muscle tone improves over time (NINDS, archived).

Side by side

Six approaches compared

For every condition we look at the same six approaches: what each involves, what it typically costs, and what a patient can realistically expect.

ApproachWhat it involves Estimated costWhat to expect
Conventional medicine (AMA) Find and treat the cause first; then physical, occupational and speech or feeding therapy, early intervention, braces and equipment as needed. Some causes have specific treatments, such as nusinersen, onasemnogene abeparvovec and risdiplam for SMA. Early intervention is free or reduced-cost for eligible children under 3; Medicaid EPSDT covers medically necessary care for enrolled children under 21. Genetic tests, specialist visits, private therapy and SMA medicines: cost estimate being researched. Depends on the cause. Some babies’ tone improves over time; for others it is lifelong. Early SMA treatment tends to help more than later treatment.
Chiropractic No role. We found no studies of chiropractic care for hypotonia. Not applicable. Not a treatment for low muscle tone. Loose joints and possible neck instability (for example in Down syndrome) make spinal manipulation a real safety concern in these children.
Acupuncture Little research. Two small Chinese trials in babies with cerebral palsy and sitting problems (some with low-tone CP) reported gains when acupuncture was added to sitting training; no trials in other causes of hypotonia. About $125–$230 for a first private visit and $90–$185 for follow-ups; community clinics about $50–$90. Unproven for hypotonia. If you try it, use a licensed practitioner experienced with children and keep up therapy.
Herbal medicine No herb or supplement has been shown to improve muscle tone. A few rare causes (such as biotinidase deficiency) are treated by specialists as part of medical care. Not applicable. Give a child supplements only with your clinician’s agreement. Never give honey to a baby under 12 months. We don’t list doses.
Massage therapy Gentle infant massage by parents, for comfort and bonding, alongside — not instead of — therapy. Learning to massage your own baby is free. Cost of instruction: being researched. Small studies, mostly in babies with Down syndrome, suggest gains in tone, development and vision; for other causes of hypotonia the evidence is thin.
MBHA Wellness Coach Family support: getting early intervention started, therapist-guided tummy time and play, feeding support, safe sleep and home safety, tracking milestones, and care for caregivers. Cost estimate being researched. Early intervention evaluations, CDC milestone tools and Parent Centers are free. Supports — never replaces — your child’s doctors and therapists.

Approach 1 of 6

Conventional medicine (AMA)

Treatment begins with a thorough evaluation. Once a diagnosis is made, the underlying condition is treated first, followed by therapy for the low tone itself (NINDS, archived). For newborns, the main treatments are physical, occupational, speech and feeding, and breathing therapy (Sparks, 2015). We name treatments but never doses.

1. Treating the cause

2. Spinal muscular atrophy: screening and treatment

Where newborns are screened for SMA, it can be diagnosed in the first week of life (Morton et al., 2022). That matters, because treatment early in life tends to help more than treatment later (NINDS), and early treatment can help prevent the most severe symptoms and early death (California Department of Public Health).

3. Therapy

  • Physical therapy can improve motor control and overall strength; occupational therapy helps with everyday activities; speech-language therapy can help with breathing, speech and swallowing (NINDS, archived).
  • What the research shows: a review of therapy for young children with central hypotonia found good evidence for treadmill training to help children with Down syndrome walk; evidence for most other approaches was weaker (Paleg et al., J Pediatr Rehabil Med, 2018).
  • Feeding and swallowing: a speech-language pathologist can treat swallowing problems; changing foods or head position while eating can help, and in serious cases a feeding tube may be needed (MedlinePlus).

4. Braces, equipment and hips

Orthotics (braces) improve foot alignment in children with hypotonia who walk, but in babies who are not yet walking they may hold back motor development, so timing matters (Paleg et al., 2018). Because children with significant, ongoing hypotonia are at higher risk of hip problems, one review recommends a hip ultrasound between 6 weeks and 6 months and yearly orthopedic checks for those with persistent low tone (Livingstone et al., 2025). Ask your team about a plan.

5. Early intervention and school

Early intervention is free or reduced-cost for eligible children, and you don’t need a doctor’s referral: call your state’s program and ask for an evaluation. From age 3, ask your local public elementary school for a preschool special education evaluation (CDC). Early intervention is Part C of the Individuals with Disabilities Education Act (IDEA), which serves infants and toddlers from birth through age 2 under an Individualized Family Service Plan (IFSP); from 3, services are planned in an Individualized Education Program (IEP) (ECTA Center).

What it costs

  • Early intervention: free or reduced-cost for eligible children (CDC).
  • Medicaid: EPSDT covers comprehensive care for children under 21 enrolled in Medicaid, including medically necessary services to correct and ameliorate health conditions (Medicaid.gov).
  • Genetic testing, specialist visits, private therapy, braces and SMA medicines: cost estimate being researched.

What to expect

Finding treatable conditions early lets treatment and early intervention begin sooner (Cicala & Mercuri, Dev Med Child Neurol, 2026).

Find a medical doctor in our directory

Approach 2 of 6

Chiropractic

Chiropractic care has no role in treating hypotonia. A PubMed search in October 2026 for chiropractic or spinal manipulation and hypotonia or the “floppy infant” found only one unrelated study, of adults with low back pain, and no studies of children with low muscle tone.

Safety concerns are real. Children with low tone can have loose ligaments and joints (NINDS, archived). In Down syndrome, misshapen bones at the top of the spine can press on the spinal cord (atlantoaxial instability); NICHD warns that certain movements during anesthesia or surgery could cause permanent injury (NICHD). A review in a chiropractic journal warned that adjusting the neck of a person with Down syndrome can have potentially fatal consequences (La Francis, J Manipulative Physiol Ther, 1990).

  • In children under 10, most reported side effects of spinal manipulation are mild, such as more crying or soreness, but a rib fracture in a 21-day-old baby has been reported, and the risk of moderate and severe side effects is unknown (Corso et al., Chiropractic & Manual Therapies, 2020).
  • Serious problems after spinal manipulation are very rare, but people with underlying health problems may be at greater risk (NCCIH).
  • MBHA’s advice: do not have a floppy baby or a child with loose joints or a known genetic syndrome manipulated. Spend the time and money on the evaluation and therapy described in the Conventional section.

Find a chiropractor in our directory

Approach 3 of 6

Acupuncture

We found little research on acupuncture for hypotonia.

What the research says

  • Two Chinese trials, each of 120 infants and young children with cerebral palsy who had trouble sitting, reported better sitting scores when acupuncture was added to sitting training, with larger gains in spastic and low-tone (hypotonic) CP than in other types (Zhang & Du, Zhen Ci Yan Jiu, 2013, Zhang et al., 2015). The 2015 trial compared two acupuncture styles rather than acupuncture with no acupuncture. Both were published in Chinese, and their abstracts don’t say whether assessors were blinded.
  • We found no trials of acupuncture for hypotonia from other causes, such as Down syndrome, genetic or muscle diseases. See our Cerebral Palsy guide for the wider research on acupuncture in CP.

Safety

Relatively few complications have been reported, but problems have come from non-sterile needles and improper treatment; in the U.S., needles must be sterile and single-use (NCCIH). If you consider it, choose a licensed acupuncturist experienced with children, tell your child’s doctor, and don’t let it replace evaluation or therapy.

What it costs

Published examples run about $125–$230 for a first private visit and $90–$185 for follow-ups; community clinics about $50–$90 a visit (The Pricer).

Find an acupuncturist in our directory

Approach 4 of 6

Herbal medicine

No herb or supplement has been shown to improve muscle tone. A PubMed search in October 2026 for herbal or dietary supplements and hypotonia found case reports, genetic studies and one laboratory study, but no trial of an herb or supplement for low muscle tone in children.

A few rare metabolic causes, such as biotinidase deficiency, where the body can’t recycle the vitamin biotin, need lifelong treatment (MedlinePlus Genetics). That is specialist care after a diagnosis, not something to try at home.

Safety first

  • Many dietary supplements haven’t been tested in children, “natural” doesn’t always mean safe, labels don’t always match what’s in the bottle, and supplements can interact with medicines. Ask your child’s health care provider before using any (NCCIH).
  • No honey before 12 months, including in “natural” remedies: honey can contain the bacteria that cause botulism (NHS).
  • Give a child supplements only with your clinician’s agreement. For feeding and growth worries, ask for a dietitian through your child’s care team. We don’t list doses here.

Approach 5 of 6

Massage therapy

Gentle massage can be a calm, close time with your baby. Most of the small body of research is in babies with Down syndrome.

What the research says

  • A systematic review of therapies for young children with central hypotonia gave massage its top rating for improving muscle tone, motor development and use of vision in infants with Down syndrome, but rated it only “possibly effective” for other groups (Paleg et al., 2018).
  • In a Spanish study of 32 babies with Down syndrome, daily parent massage for 5 weeks led to short-term gains in developmental scores (Pinero-Pinto et al., 2020). In a small Italian pilot trial, babies with Down syndrome who received massage developed sharper vision sooner (Purpura et al., Early Hum Dev, 2014).
  • In a small U.S. trial of 28 children under 4 (14 with Down syndrome), parent- and trainer-given qigong massage improved gross motor scores (Silva et al., Am J Occup Ther, 2012).
  • These studies are small and short, and most are in one condition. Massage works best as comfort and bonding alongside therapy, not as a replacement for it.

Safety

The risk of harm from massage appears low, though rare serious problems have been reported, some with vigorous deep-tissue massage. Don’t use massage to put off seeing a health care provider (NCCIH). Use gentle strokes, avoid stretching or twisting the neck (especially in Down syndrome; see the Chiropractic section), and ask your child’s physical therapist to show you safe techniques.

What it costs

Massage you give your own baby is free. Cost of classes or instruction: being researched.

Find a massage therapist in our directory

Approach 6 of 6

MBHA Wellness Coach

Waiting for answers about a floppy baby is hard. An MBHA Wellness Coach can help with everyday care — alongside, never instead of, your child’s doctors and therapists.

Act early

  • CDC’s “Learn the Signs. Act Early.” program offers free milestone checklists and a Milestone Tracker app for ages 2 months to 5 years (CDC), with milestones listed by age (CDC).
  • If you’re concerned, don’t wait: bring a completed checklist to the doctor, ask about developmental screening, and contact early intervention (CDC). A coach can help you prepare for these calls.

Tummy time and play, guided by therapists

  • Supervised tummy time, while baby is awake and watched, helps strengthen the neck, shoulder and arm muscles needed to sit, crawl and walk. NICHD’s Safe to Sleep campaign suggests short sessions after a diaper change or nap, a rolled-up towel under the arms for support, and a toy or a familiar face in front of baby (NICHD).
  • If your baby struggles with tummy time, ask your physical therapist how long and how often to practice and which positions and supports suit your child. A coach can help you fit the home exercises your therapists recommend into the family’s day.

Feeding support

  • Weak sucking and feeding difficulties can come with low tone, for example in Prader-Willi syndrome, where nearly all infants need feeding help (NICHD). A simple log of feeds, coughing and weight helps the care team.
  • Ask for a speech-language pathologist if feeding is slow or your baby coughs or chokes; they treat swallowing problems (MedlinePlus). New swallowing or breathing trouble needs prompt medical attention (see the alert at the top of this page).

Safe sleep and home safety

  • Place all babies — including those born preterm and those with reflux — on their backs to sleep, for naps and at night, until they are 1 year old, and never on soft surfaces such as couches, pillow-top mattresses, quilts or thick blankets (NICHD). Ask your doctor if your baby has a breathing condition.
  • Limit time in car seats, bouncers, swings and carriers where the head rests against a surface, and hold baby upright for “cuddle time”; NICHD suggests both to help prevent flat spots on the head (NICHD).

Finding services and caring for caregivers

  • Parent Centers — nearly 100 across the U.S. and territories — work with families of children and youth with disabilities from birth to 26 (Center for Parent Information and Resources).
  • A coach can help you plan questions for appointments, organize reports and test results, share care with family and friends, and protect time for your own sleep, meals and rest.

Another approach

Questions to ask your child’s doctor

These questions can help you make the most of appointments:

Member stories

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This page is for education only and is not medical advice. Costs are typical U.S. ranges and estimates; yours will depend on your provider, location and insurance. Talk with your doctor before starting, stopping or combining any treatment. In an emergency, call 911. See our disclaimer.

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