my baby boy is 4 months old and his current weight is 9 kgs and his birth weight was 2.6 kgs . is he gaining normally ?? he feeds breast milk in every 1 hr or 2 hr and one time formula milk in morning

A. thank you for reaching out was with this question please note that the birth weight should only double by 5 to 6 months and triple at 1 year old it seems to be a little on the higher side I would suggest that bring it up with your pediatrician who can confirm if after an examination is there any cause of concern as long as a child is active I don't think you should be worried