Wats the ideal weight for 1 1/2 months old Girl Baby? Her birth weight was 3.4.. after loosing weight , on 3rd day she was 3.2.. Now on 20th day she was 3.7 and on 45th day she is 4.400. is it normal? She is on breast milk. Doesn't wake up on her own even after sleeping for 4-5 hrs.. Every time we wake her up in 2-3 hrs gap, she nly takes feed for 10-15 mins.. is it ok? Frm when the babies will demand for feeds