I never had it as an issue with my first 3 pg's but with my last one I had no appetite at all and that was unusual for me because usually being pg makes me super hungry. I think I only had a few weeks of the 3rd trimester where I felt hungry and then in the last few weeks I went back to no appetite again. It didn't affect his size at all - he was just over 10lb and 59cm long LOL.