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Week by week guide to fetal development

A look at what's happening inside your womb and to you over the forty weeks of pregnancy


Posted: 22 October 2009
by ThinkBaby

When you become a member of ThinkBaby you are given the chance to receive weekly Fetal Development newsletters. These e-mails contain information on how your baby is growing in the womb, advice on what to expect at your current stage of pregnancy and top tips on how to combat common problems such as morning sickness.

Two easy steps are all it takes to sign up for the Fetal Development e-mails. After you have joined ThinkBaby visit the 'My Newsletter' page in your profile. Simply click on the box next to 'Fetal Development newsletters' and then visit the 'My Baby' page and select the date your baby is due.

Alternatively, if you don't want to receive this information straight to your inbox, you can read them all here at your own leisure.

Once your baby is born you can choose to receive monthly Baby Development newsletters in the same way.


The first trimester
Weeks: 1-4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13

The early stages of preganancy will be dominated by you getting used to the idea of being pregnant and thinking over all of the implications of having a child. Even if you planned to have a baby you might be surprised by what you feel about actually being pregnant. For many women this is a time of great excitement and joy and it can be difficult to think about anything else than the life growing inside you and impending motherhood. The early stages of pregnancy can also make you feel tired and sometimes unwell, so make sure that you look after yourself and are getting sufficient nutrition for you and your baby even if you're feeling unwell.

The second trimester
Weeks: 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27

The second trimester is usually the part of pregnancy that women enjoy most. More often than not any tiredness and illness from the first trimester now fades and you will most likely feel a surge of energy and the joy of knowing that your growing baby is safely through the most critical stages of development.

By now you're probably growing used to the idea of being a mother and you can now start to think about making things ready for after the birth and of course, thinking about what kind of birth you'd like, and where.

The third trimester
Weeks: 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40

This is the trimester where you'll really start to grow heavy with child and your excitement at the approaching birth will probably be tinged with anxiety and, later, impatience to meet your baby.

Don't be surprised if you have the sudden urge to tidy and clean in this trimester, it's the nesting instinct kicking in, and it may be particularly strong just before labour begins.


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Discuss this story

more info on fetal development for fraternal twins please

Posted: 21/06/2007 at 12:47

Hi Ellee there is a website you may find helpful it's www.i-am-pregnant.comhope this help's you!! enjoy your pregnancy

Posted: 24/06/2007 at 14:23

Hi Ellee, congratulations on the twins!
We have stuff in the pipeline for you, but in the meantime have you already read http://www.thinkbaby.co.uk/news/article/mps/UAN/378/V/3/ this article?

Posted: 03/07/2007 at 21:57

i have just found out i am pregnant. so so happy but i have had 2 misscarriges an a etopic pregnantcy in the last 3years should i be worried

Posted: 11/03/2008 at 22:40

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