My baby is 1.5 month and her birth weight was 2.5 kg and in 1.5 month she is just 3.22kg. It was 3.12 kg on 15th May and today it's just 3.22kg I.e. 100 gm in 10 days. She is exclusively breastfeeding and I can feel her feeding properly for 15-20 minutes every 2 hours in day and 3-4 hrs in night. I give her 1 breast per feeding so that she can get hind milk too and can see milk spilling from her mouth at the end when she is full, so assuming my milk supply is not the problem. Please help if someone else faced same issue and give some advise. I do not want to give top feed with formula. Doctor has given some multivitamin and calcium drops but I am really concerned.