Hi, My son is 6 months and 22 days old. He gained his birth weight on his 10th day and doubled his birth weight when he completed 4 months. Since his 4th to 6th month he has not gained much. He is being breastfed properly and started with solids post 6 months. He has been crossing each milestone and is super active. Is his weight a concern? His birth weight was 2.6 kgs and currently his weight is 6 kgs