My baby is 4mo (just yesterday). His head circ is 16", his weight is 11lbs and his length is 24". He was 6lbs. 8oz., 18" long when he was born. My Mom came to visit recently and said he looked like a one month old. She's "concerned" about his skinnyness. She has no esperience with a breastfed baby. I've been told not to be concerned about weight, but to look more towards wet and dirty diapers. He pees waay more than 6 a day and poops sometimes 0 a day but sometimes 3-4 times a day. This is my first successful breastfeeding so I'm learning the ropes and getting hit with my mothers "concerns". Can someone please tell me if I have anything to be concerned about?