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Mumsworld Pregnancy Calendar Week 13

Here's an interesting fact. Your breasts will already be getting ready for your baby's arrival at week 13 – even though there's still months to go before the birth. 

Your baby's development

Your growing baby now measures around 8cm. They're now very active, and stretching, kicking and turning, although they're still far too small for you to feel it. The kidneys are starting to work and are now starting to send urine to the bladder. 

Each week, your baby's proportions become much more like that of a newborn baby, and their head is now about a third of the size of their body.

You and your body

During this stage of pregnancy, breasts can start to feel a bit lumpy – but don't worry, it's just that your mammary glands and ducts are developing in time for the birth. If you are particularly worried ask your doctor at your next check-up. Your breasts may already have started making a thin yellow liquid called colostrum. This is packed with nutrients and will be the first milk that nourishes your baby after the birth before their regular milk starts to flow. 

The good news is that size doesn't matter so even if your breasts are small, you should still be able to breastfeed. 

Did you know?

Some Health Care Professionals recommend switching to non-underwired bras during pregnancy. Although it hasn't been proven that underwires could be harmful, they may restrict the natural changes that your breasts go through, and interfere with your developing milk ducts. If fitted properly, underwired bras are fine in the first stages of pregnancy but near the end it's best to switch to a non-underwired one. There are plenty of good options around that will give you all the support you need.