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My child swallowed a piece of lego 2 to 5 years?

A single swallowed Lego piece almost always passes through on its own within a few days without any treatment needed. Watch for warning signs rather than checking every diaper or toilet visit.

Serious problems from a plain plastic toy piece are rare; the main things to watch for are choking, drooling, chest or belly pain, vomiting, or not wanting to eat.

Strength of evidence

Good

Based on children's hospital clinical guidelines and a systematic review of pediatric foreign body ingestion; the exact 'how many days' figure comes from a small, informal human study rather than a large trial.

What the evidence says

Most of the time, a swallowed Lego piece is not dangerous. Children's digestive systems are surprisingly good at moving small, smooth plastic objects along and out the other end without any help.

A well-known study had adult volunteers swallow a Lego head on purpose, just to time how long it took to come out. It usually showed up within about two days, and nobody had any problems at all. In real children, doctors generally say it can take anywhere from a few days up to about two weeks for a swallowed object to pass, and there is no need to search through poop to check.

The main job now is to watch your child, not to hunt for the Lego piece. Look out for drooling, gagging, pain in the throat, chest or belly, vomiting, refusing food, or blood in the stool. If any of these happen, or your child starts coughing, wheezing, or has trouble breathing, get medical care right away, since that can mean the piece is stuck somewhere it shouldn't be.

There are exceptions that always need urgent care no matter the size: button batteries, strong magnets (especially more than one), sharp objects, or anything that could contain lead. If you are ever unsure exactly what your child swallowed, it is safer to call a doctor, health line, or poison control and describe it.

We did not find a specific Canadian home-care guideline written just for swallowed small toys, but Canadian pediatric research on related choking and ingestion risks lines up with the international advice given here.

Sources

✓Reviewed by CH, MD, FRCPC

Reviewed by a specialist physician certified by the Royal College of Physicians and Surgeons of Canada, who has read this answer against the sources listed above and confirmed it reflects them. That is not medical advice about your child. How we review

Answer checked September 24, 2026

Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so this may not apply to you. In an emergency, call your local emergency number. What Founded Parent cannot do

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Educational information only. Not medical advice, not a diagnosis, and no doctor-patient relationship is created by using this. Founded Parent has not examined your child and does not know their history, so its answers may not apply to you. Never delay or disregard advice from a qualified health professional because of something you read here. In an emergency, call your local emergency number.