1. Could be due to dryness. During pregnancy our skin can become very dry. I guess avoid using soaps which may cause it to be drier. Other than that I'm not sure...you could check with your doctor if it gets worse.
2. I won't worry about baby weight. As long as you are eating reasonably well your baby should be fine. I really dont't understand why so much emphasis is placed on baby weight during pregnancy. Maybe just different culture I dont't know... We usually dont't get to know our baby's weight till they are born