Your 9 months Pregnancy You're 33 weeks pregnant You’re well into your third trimester now, as you enter the 33rd week of your pregnancy 1 of Ad break How big is your baby?By the end of this week, your baby will be 30cm from crown to rump, or 43cm from top to toe. Next time you grab a cucumber from your fridge, take a good look at it – that’s about the size of your baby. He’s continuing to build up his fat stores.Now find out how your baby is growing… How is your baby growing?Your baby’s head increases just over 1cm this week because his brain is going through some rapid growth. His body and head are also now in proportion. He’s starting to store iron, calcium and phosphorous. These minerals are important for his bone development.Now find out what’s happening to your body… What’s happening to your body?You can start to feel a little ungainly at this stage, gaining about a pound a week! The muscles and ligaments around your pelvis are getting looser to prepare your body for the birth. This can cause some mums to get backache and you might find yourself waddling a bit. You can help to reduce the pains in your back by trying to keep it as straight as you can or taking a warm, relaxing bath to soothe your joints. Learn more about what symptoms to expect this week and check out our week by week pregnancy guide...Find out about 32 weeks pregnant in pictures and then look forward to what will be happening in the 34th week of your pregnancy. By Sara Mackenzie Comments Latest on MadeForMums Must-have toys for Christmas from the biggest sellers Why e-books might be better for your toddler than paper ones Toddler wets herself after being blocked from using toilet on plane Could these be Beyonce and Jay-Z's twin baby names?