Baby Constipation: Causes, Signs and Safe Remedies for UK Parents

Quick answer: A baby is constipated when stools are hard, dry and difficult to pass, not simply infrequent — some breastfed babies go 5–7 days and are fine. Common triggers are starting solids, low fluids, low fibre, formula changes and illness. Extra fluids, pear or prune from six months, tummy massage and a warm bath help. See your GP if there is blood, pain or vomiting.

What parents need to know

It can be worrying to see your baby straining or going days without a poo. But what's normal when it comes to baby bowel movements, and when should you be concerned?

The short answer: normal varies enormously. Some breastfed babies poo after every feed; others can go 5–7 days without one and be perfectly fine. The key is whether the stool, when it comes, is soft and easy to pass.

What is normal for baby poo?

Breastfed babies

Breastfed newborns typically have frequent, yellow, mustardy, runny stools — sometimes after every feed. As they get older (usually after 4–6 weeks), many breastfed babies naturally become less frequent — going every few days is completely normal as breast milk is so efficiently absorbed. As long as the stool is soft, infrequent is not constipation.

Formula-fed babies

Formula-fed babies tend to have slightly firmer stools and may go 1–2 times per day. Harder stools and more infrequent emptying are more common in formula-fed babies.

When solids start

Starting solid foods is a common trigger for constipation as the digestive system adjusts. Stool will also change colour, texture, and smell as the diet changes.

Signs of true constipation in babies

• Hard, dry stools that look like pellets or pebbles
• Significant straining with discomfort or crying during passing
• A hard, distended tummy
• Infrequent stools that are difficult to pass (not just infrequent stools)
• Blood in the stool (from small tears caused by hard stool)

Note: grunting, straining, and going red in the face is normal for all babies passing stool. This alone is not constipation.

Common causes

• Starting solids: The digestive system is adjusting to new foods and textures.
• Low fluid intake: Particularly in warm weather or when breastfeeding is reducing.
• Low fibre: Too much refined cereal or not enough fruit, veg, and water in the diet.
• Formula changes: Switching formula brands can affect stool consistency temporarily.
• Illness: Fever or illness can dehydrate babies, leading to harder stools.

How to help a constipated baby

Extra fluids

For babies under 6 months, extra breastfeeds or a small amount of cooled, boiled water (if formula-fed) can help. From 6 months, offer sips of water with meals. Do not give fruit juices to babies under 12 months.

Dietary adjustments (6 months+)

Include more fruit and vegetables with natural laxative effects: pear, prune, plum, apricot, mango, and broccoli are particularly helpful. Avoid too much rice cereal or banana in the short term.

Tummy massage

Gentle clockwise circular massage on the tummy can help stimulate the bowel. A bicycle legs movement — gently cycling your baby's legs while they lie on their back — can also help.

Warm bath

A warm bath can help relax your baby's muscles and stimulate a bowel movement.

Frequently asked questions

Is it normal for a breastfed baby to go days without pooing?

Yes. After about 4–6 weeks many breastfed babies go every few days because breast milk is so efficiently absorbed. As long as the stool is soft when it comes, infrequent pooing is not constipation.

Can I give my baby fruit juice for constipation?

No. Do not give fruit juices to babies under 12 months. For babies under 6 months offer extra breastfeeds or a little cooled, boiled water if formula-fed; from 6 months offer sips of water with meals.

Which foods help a constipated baby from 6 months?

Pear, prune, plum, apricot, mango and broccoli have natural laxative effects and are particularly helpful. Avoid too much rice cereal or banana in the short term.

When should I contact my GP about baby constipation?

Contact your GP if your baby is in significant pain, there is blood in the stool, a newborn under 6 weeks has not passed stool, home remedies aren't working after a few days, or your baby is vomiting or seems unwell.