READ MORE Week 1 Your baby moves its arms and legs quite actively. He cannot lift the head up while on his back. He also cannot turn his head. When he is on his tummy he can turn his head a bit. READ MORE Week 2 Your baby is capable of crying loudly. This means it has good lung capacity and there is no obstruction in his airways. He continues to gain more.. READ MORE Week 3 Joy of joys! Your baby shows signs of moving its head from side to side a little bit. Make sure to place your baby on its tummy for a while every day. READ MORE Week 4 Your baby’s movements become more coordinated as weeks go by. Now your baby grabs things that come into its hand with a satisfyingly powerful grip.