Baby Constipation: Causes, Signs & What Actually Helps

Baby poo is one of the most discussed topics in new parenthood — and constipation is one of the most common concerns. Here's how to tell what's normal, what's constipation, and how to help.

What's normal?

Breastfed babies: In the first weeks, most breastfed babies poo multiple times a day. But from around 4–6 weeks, it's completely normal for a breastfed baby to go several days — even up to 7–10 days — without a poo and be entirely comfortable. Breast milk is so well absorbed that very little waste is produced.

Formula-fed babies: Typically poo more often than older breastfed babies but less often than newborn breastfed babies. 1–4 times a day is common; once every few days can also be normal.

Weaning babies: Introducing solids often temporarily changes poo consistency and frequency.

Frequency alone doesn't define constipation. What matters is whether the poo is hard and uncomfortable to pass.

Signs of actual constipation

• Hard, dry, pellet-like poo — this is the key sign
• Crying or clear straining and distress when trying to poo (some straining is normal; distress is not)
• Poo not coming despite clearly trying
• Hard, bloated tummy
• Poor feeding associated with discomfort
• Infrequent poo that is hard when it comes (not just infrequent poo that is soft)

What causes constipation in babies?

Formula: Some formulas cause harder poo than others. Formula protein is harder to digest than breast milk.

Introducing solids: The digestive system is adapting. Low-fibre first foods (baby rice, white bread, banana, cooked carrot) can contribute to constipation.

Dehydration: Particularly in hot weather or illness.

Cow's milk protein sensitivity: Can cause constipation in some babies.

Illness or fever: Dehydration and changed eating patterns during illness.

What helps

For formula-fed babies

• Check you're making feeds correctly — exact scoops to exact water (over-concentrated formula is a common cause of constipation)
• Try a different formula — ask your pharmacist or health visitor about "comfort" formulas
• Offer cooled boiled water between feeds (not instead of feeds)

For babies starting solids

• Increase fluid intake — water with meals from 6 months
• High-fibre foods: Pears, prunes, plums, peas, broccoli, oats
• Reduce constipating foods temporarily: banana, white rice, cooked carrot
• Prune or pear purée is particularly effective for soft-on-solids constipation

For all babies

Tummy massage: Gentle clockwise circles around the navel (following the direction of the digestive tract). The "I Love You" massage stroke (see our baby massage guide) can help move stuck wind and waste.

Bicycle legs: Gently cycle baby's legs while they're on their back — helps stimulate bowel movement.

Warm bath: Relaxes the body and can encourage bowel movements.

More tummy time: Time on the tummy creates natural pressure on the abdomen that can help.

What NOT to do

• Don't give fruit juice to babies under 6 months
• Don't give laxatives without GP advice — lactulose is sometimes prescribed but should be used under guidance
• Don't add extra scoops of formula or dilute it — neither helps and both can harm
• Don't give honey or any alternative remedy before checking with a pharmacist

When to see your GP

• Constipation lasts more than 2 weeks
• Baby is in significant pain
• You see blood in the poo or on the nappy
• Constipation starts in the newborn period (first 1–2 weeks)
• Associated with poor weight gain or feeding refusal
• No poo at all in the first 48 hours of life (normal transition poo — meconium — should come within 48 hours)

A note on "straining"

Many babies grunt, go red in the face, and strain dramatically while producing soft, easily-passed poo. This is normal — they're learning to use their muscles and coordinate the process. This is NOT constipation as long as the poo is soft. The medical term is "infant dyschezia" — it resolves on its own usually by 3–4 months as babies learn to coordinate.

If your baby strains but produces soft poo, no action is needed.