Your 9 months Pregnancy You're 16 weeks pregnant Find out what your baby is up to in your 16th week of pregnancy 1 of Ad break How big is your baby?Your baby is now around 12cm long from the top of her head to her bottom – the size of a pear. She’s now going through another phase of rapid growth and it’s also an active time, with your baby enjoying rolling over, kicking and somersaulting while there’s still room for her to do so.Now find out how your baby is growing… How is your baby growing?Step by step your baby’s organs are moving on from formation to function, and it’s around this time that your baby’s intestines start to work. From now on your baby starts to digest some of the amniotic fluid that she’s been busy swallowing and expelling and this helps to form your baby’s first meconium, which begins to collect in her colon. Meconium is the dark, greenish, gooey substance of your baby's first poo. Don’t worry though, your baby’s still months away from having her first bowel movement, which will usually happen after birth, but sometimes just beforehand. Now find out what’s happening to your body… What’s happening to your body?Here comes your bump! As your baby undergoes a growth spurt you may notice you’re putting on weight more obviously too. You’ll probably want to think about extending your maternity wardrobe so you can dress your new bump in the most flattering ways. You may be feeling occasional aches and brief pains or twinges in your abdominal area, as the ligaments of your womb stretch to accommodate its increasing size. However, if the pains are sharp and severe then be sure to contact your midwife or doctor about them. You may also find you’re feeling a bit bunged up bottom-wise. Constipation is a common pregnancy complaint – make sure you drink lots of water and fluids and have a well-rounded diet with plenty of fruit and veg. Learn more about what symptoms to expect this week and check out our week by week pregnancy guide... Have a look at 15 weeks pregnant in pictures to see what happened last week, or check out 17 weeks pregnant in pictures to see what’s happening in the next stage of your pregnancy. By Sara Mackenzie Comments Latest on MadeForMums Princess Marie-Chantal’s touching support for Kate Middleton (Exclusive) Danielle Lloyd's luxury pram pick for baby no 4 Rochelle Humes' divisive method for clearing her baby's bunged up nose Viral wedding invitation tells guests: "Breastfeed in the toilets!"