My baby is 1 and half months old his birth weight was 3.04kg now he is around 4.6 kg is it fine if he gains 1 and half kg weight from the birth weight

A. Your baby will gain about 1 to 1½ inches (2.5–3.8 centimeters) in length and 2 pounds (907 grams) in weight this month. But it's also OK if your baby grows a little more or a little less. At this point, you probably know the signs that your baby is hungry or full.