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First Trimester

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Week by week

Your little one

Hello little prune! Can you believe that your little one is now about 3cm long and weighs 4 grams? By this week, all vital organs - the liver, kidneys, intestines, brain and lungs - are fully formed and the digestive system continues to develop.

The buds of its milk teeth are forming and its toes are separating. It’s even starting to sleep, wake up and exercise its muscles.

Day by day, new details are appearing, including the tiniest fingernails you can imagine. In comparison to the rest of its body bub also has a really big head – that’s because its brain is developing faster than anything else!

How are you?

By week 10, your uterus has doubled in size – picture a grapefruit! Your bump probably isn’t showing yet so your secret might still be safe.

Hopefully you’ve picked up some healthy eating habits to support the extra nutrients your little one needs, like iron. Iron is important for the transport of oxygen to tissues throughout the body and helps develop your little one’s brain. It’s also important that you have good iron stores in preparation for labour and birth. If you’re deficient in iron, there are a few signs to look out for, like feeling tired, unfocused and a bit unwell. Your healthcare professional may recommend an iron supplement, but in the meantime, read our list of iron-rich foods and keep eating lots of them. If you have an orange juice with your food, the vitamin C will help you absorb the iron. Remember to avoid milk, coffee or tea though (these can limit the absorption).

See what the
community has to say

A place to share the joins and questions of parenthood with other mums, and our Careline of experts.

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