Your baby is around 14cm long (around the size of a medium carrot) and 225g in weight.
Teeth buds for your baby’s milk teeth have already formed and behind his shut eyelids your baby’s eyes are now moving from side to side, strengthening the eye muscles. The last organ to develop is the lungs and this will take many weeks – this is why many premature babies need help with their breathing. At this stage, tiny air sacs (alveoli) are starting to develop inside your baby’s lungs.
If your baby is a girl she will have developed all her sex organs, uterus, vagina and fallopian tubes and will be storing around 6 million eggs in her ovaries that hold part of the genetic makeup of your future grandchildren. By birth the number of eggs will have fallen to one million. In boys, testes will now be apparent.
By now an ultrasound scan should be able to distinguish easily between a boy and a girl, so if you don’t want to know the sex of your baby be sure to say so when you go for your mid-term scan around week 20. The scan is to check up on foetal development and verify the gestational age of your baby. It can be quite an experience and if your partner can be with you to share in it then so much the better. You may get to see your baby moving around in the womb and should also be able to take away printouts of a few stills from the scan, which is particularly useful if your partner couldn’t be with you.
Your breasts will be growing and getting ready to produce milk and the areola - the dark areas around your nipples - become larger. Over the course of your pregnancy your bra size will probably increase by a couple of bra sizes.
As your skin grows rapidly to accommodate your new shape your skin will most probably be quite itchy and dry and most women develop stretch marks and even rashes where the skin is stretched. Applying creams or oils won’t guarantee that your stretch marks will disappear after pregnancy, but they should help with the dryness and itching. Make sure that whatever you massage onto your bump to soothe it is safe for use during pregnancy.
Phew – you may have noticed you’re not having to go to the loo quite so often. This is because your uterus moves up further into your abdomen as your baby grows, so there’s less pressure on your bladder.
You may find you’re more vulnerable to getting colds and coughs while you’re pregnant, which is bad timing as you need to be careful about taking any medicines. Check out our list of what to do when you’re feeling poorly and which medicines are safe to take.
However small your bump, you’re likely to be looking a little pregnant, which means you’ll get lots of attention – albeit most of it aimed at your tum. Prepare yourself for the fact that lots of people will want to touch your bump, even perfect strangers.
Remember that all pregnancies are different and this is only an approximate guideline to how your baby is developing. If you do have any concerns, talk to your midwife or GP.
Learn more about what symptoms to expect this week and check out our week by week pregnancy guide...
Meet mums-to-be who are at the same stage as you, by joining one of our birth clubs, and swap stories and advice.