Hello Experts, I am a formula fed mother. My baby boy was a premature with 34 weeks with weight of 1.86 now he is 3.29 but he seems to be lean his body seems to lean why is that ?? can anyone answer this

A. hello dear the weight of the child increases by approximately 500 grams each month till 6 months of age make sure to formula feed the child for the initial 6 months and start weaning diet only after 6 months completion