How to Tell Your Baby Is Full and Gaining Weight Well

Babies don’t come with a little sign saying “I’m full, thanks”. So it’s only natural to wonder whether yours has had enough – especially if you’re breastfeeding and can’t see the millilitres. The good news is that babies actually “talk” pretty clearly. You just need to know what to look for.

The short answer: A full baby slows down, lets go on their own, turns away and relaxes their hands. From about day 5–6, look for at least 6 heavy, wet nappies a day, and expect your baby to be back to birth weight by about 2 weeks.

What does a hungry baby look like?

Hunger starts quietly. The early signs are:

• searching with their mouth and turning their head to the side (the so-called rooting reflex);
• lip-smacking, licking their lips;
• hands to mouth.

Crying is a later sign. If you can catch the early cues, feeds are usually calmer for both of you.

And a full baby?

A full baby usually:

• slows down or stops sucking and lets go of the breast or teat on their own;
• turns their head away;
• relaxes their hands and body – tight little fists open up;
• looks content or drifts off to sleep peacefully.

With bottle-feeding, the CDC advises not making your baby finish the bottle if they’re already showing they’re full. Milk left in the bottle isn’t a failure. 😊

What do nappies tell you?

Nappies are the most honest diary. According to the NHS:

• in the first 48 hours – about 2–3 wet nappies a day;
• from around day 5–6 – at least 6 heavy, wet nappies a day;
• from day 5 onwards in breastfed babies – at least 2 yellow poos a day.

The colour of the poo changes from dark and sticky in the first days to yellow. That’s another good sign that the milk is “getting where it needs to go”.

How do you know they’re gaining weight well?

In the first days, most babies lose a little weight – that’s expected. The key milestone is for your baby to be back to their birth weight by about 2 weeks old.

After that, your paediatrician tracks growth at check-ups by plotting weight, length and head circumference on so-called growth charts – graphs that show whether your baby is growing steadily along their own line. Your baby doesn’t need to be “the biggest” – what matters is that they grow evenly.

One more reassuring sign health services mention: your baby seems content and settled after most feeds and often lets go of the breast or teat on their own at the end.

And if I’m breastfeeding – how can I be sure?

When you’re breastfeeding, you can’t see how much your baby has drunk, and that can be nerve-racking. So look at the overall picture: at least 8 feeds in 24 hours, audible swallowing during feeds, enough wet nappies and steady weight gain. If all of that is in place – your baby is getting what they need.

For the dads

Keeping a “nappy diary” is the perfect job for you. One note on your phone, two columns – wees and poos. Sounds modest, but this is exactly the information your paediatrician will want to hear.

When to call your paediatrician

Contact your doctor or health visitor without delay if:

• your baby isn’t back to their birth weight by about 2 weeks;
• there are fewer wet nappies than usual;
• your baby is unusually sleepy and hard to wake for feeds;
• they seem constantly hungry and unsettled after feeds, or are floppy.

These aren’t reasons to panic – just signals that it’s a good idea for someone to take a closer look.

📖 Read next: How Much Milk Does Your Baby Need, Month by Month · Burping Your Baby: Why and How

In short

Relax, all is well if your baby has wet nappies, is growing along their own line and seems content between feeds. You already notice more than you think – and that’s the best tool any parent can have. 💛

Sources: NHS – Breastfeeding: is my baby getting enough milk?; HealthyChildren.org (AAP) – How to tell if baby is getting enough milk; CDC – How Much and How Often to Feed Infant Formula; NHS (Cambridgeshire & Peterborough) – Feeding cues and signs of getting enough milk.