When to worry about hypotonia at 18–24 months

If your toddler feels a little floppy when you lift them, or seems to tire quickly during play, your instinct to look closer is a good one.

In short

Hypotonia — lower-than-usual muscle tone, so a child can feel soft or floppy and may work harder to hold positions — is worth a prompt developmental check at 18–24 months if your child is not yet walking, tires very quickly, slips through your hands when lifted, or has clearly fallen behind on movement milestones. Low tone is a sign your clinician investigates, not a diagnosis in itself — and many causes respond well to early support. When you've genuinely noticed these things, it's always better to check sooner than to wait.

What to watch at 18–24 months

By this age most toddlers walk steadily, climb, squat to pick up a toy and stand up again, and hold themselves upright with good control. Reasons to seek a developmental check include:

• Not yet walking by 18 months, or walking that stays very wobbly and effortful.
• Floppy or "slips through your hands" when you pick them up under the arms.
• Tires very quickly with play, sitting, or holding their head and trunk upright.
• Sits with a very rounded back, props heavily on their arms, or prefers a wide "W" sitting because of weak core control.
• Difficulty with stairs, climbing or standing up from the floor compared with peers.
• Feeding, chewing or speech that also seems effortful, alongside the movement worries.

Low tone has many possible reasons, and a single soft-feeling moment is not a concern on its own. What matters is a pattern that persists, or movement milestones that are clearly lagging. A clinician's job is to find any cause and build steady strength and skill around your child's own pace.

When to refer promptly

Seek a check soon if your child is not walking by 18 months, has lost movement skills they once had, or if you notice floppiness together with feeding or breathing difficulty. Sudden loss of skills or marked weakness needs prompt medical review, not watchful waiting.

The Pinnacle way

A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an online description or a single observation. Our clinicians look first for any underlying cause, map your child's movement baseline, and shape a plan around their strengths. Where strength, posture and play skills are the focus, our occupational therapy and physiotherapy teams begin gentle, structured, play-based support. The goal is steady progress and a clear way forward — not a label.

Trusted sources

WHO ICD-11 framework for movement and developmental conditions; American Academy of Pediatrics developmental surveillance guidance; CDC developmental milestones and "Learn the Signs, Act Early" resources.

Next step — Trust what you've noticed. Book a developmental assessment with a Pinnacle clinician so any concern about your toddler's muscle tone is reviewed promptly and kindly.

This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.