No wonder you're starting to feel huge: it's crowded in there! The growing pressure on your bladder may mean frequent trips to the loo, which can make a good night's sleep difficult. You may be gaining around 500g/ 1lb a week now and roughly half of that goes right to your baby. In fact, he'll gain a third to half of his birth weight during the next seven weeks, fattening up for survival outside the womb. Thanks to these fatty deposits, his skin is getting plumper and looking healthier.