Your pregnancy: A week by week fetal development guide

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Week by week fetus development
Having a baby is an amazing thing, and following your little one through their fetal development stages while you're pregnant is fascinating.

There's certainly lots to learn, so if you're interested in how your mini-me is growing then we've put together a guide to show you exactly how your baby is changing during their nine months inside your tummy.

From the first few weeks of fetal development, when your baby is technically a ball of cells, through their transformation to an embryo and right up until your little one's birth – this guide sees you through every week in confidence.

If you're having twins, we've included information on how they will develop, too, and the changes you can make to help give your baby (or babies!) the best possible support while they grow.

You'll learn all about how big your baby is growing during its fetal development stage, how much they weigh and all the things they're learning, too. There are some surprises along the way (like how early they get finger nails!) and some useful information on scans, check ups and appointments.

Click on the image below, depending on what pregnancy week you're currently in, to learn more…

Week by week fetal development guide

Week 1

Week 2

Week 3

Week 4


Week 5


Week 6


Week 7


Week 8


Week 9


Week 10


Week 11


Week 12


Week 13


Week 14


Week 15


Week 16


Week 17


Week 18


Week 19


Week 20


Week 21


Week 22


Week 23


Week 24


Week 25


Week 26


Week 27


Week 28


Week 29


Week 30


Week 31


Week 32


Week 33


Week 34


Week 35


Week 36


Week 37


Week 38


Week 39


Week 40

Continued below...

How far along are you? We love hearing all your pregnancy stories, so if you’re expecting then leave us a comment in the box below telling us how you’re feeling, what stage you’re at and any tips you’ve got for fellow mums-to-be!

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I am about 7_8 weeks and i had bit of brown blood yesterday now I got bright red blood is this normal

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