Your 9 months Pregnancy 6 weeks pregnant in pictures Now you’re in your 6th week of your pregnancy, so here’s how your baby is growing… 1 of Ad break How big is your baby? Your baby is around 2-4mm in length from the top of her head to her bottom - the size of a grain of risotto rice - and is now growing very fast. In the early weeks your baby's length is measured from the top of the head (crown) to the bottom (rump) as if your baby was sitting down! Now see how your baby is growing… How is your baby growing? The heart (which is about the size of a poppy seed) is starting to beat on its own and blood is starting to circulate round her tiny blood vessels. The brain and digestive system are beginning to develop, along with an early form of lungs and liver. In fact, it's all starting to happen - there are little buds on the body, which will turn into arms and legs while the neck and jaw are also starting to form. Your baby actually looks like a tiny seahorse, with a curved back in a letter 'C' shape, although the tadpole-like tail is gradually disappearing. The yolk sac in which your baby is floating around provides oxygen and nutrients until your placenta is fully formed. Now see what is happening to your body… What’s happening to your body? OK, this is where the sickness often starts. Don't be fooled by the term 'morning sickness', pregnancy nausea doesn't seem to keep to a timetable - it can appear at any hour of the day. Every mum-to-be is different and some of you will throw up many times over the next few weeks, while others will feel as if you're going to be sick but it never quite comes, while some of you will escape with just occasional bouts of queasiness or almost nothing at all. It's thought that the main culprit is the pregnancy hormone HCG (human chorionic gonadotrophin), which is swilling around your body right now. Read our mums' tips on how they managed to survive morning sickness. Learn more about what symptoms to expect this week and check out our week by week pregnancy guide... Find out what happening in week 5 of your pregnancy and what’s next when you’re 7 weeks pregnant. By Sara Mackenzie Comments Daily deals from top retailers Latest on MadeForMums Mamas & Papas issue urgent recall of multistage car seats Is 'papa' becoming the new 'dada'? These hipster parents reckon so The amazing story behind little Asher's first ever modelling job Kym Marsh: Why I think Cheryl's keeping mum on her 'pregnancy'