hi my son's birth weight was 2.1 kg. now at 4.5 months his weight is around 5.5 kgs. Is this weight normal at 4.5 months?

A. Your child has gained 3400 g in this span of time which is an excellent weight gain so need not worry about it I must also tell you the logic behind calculation it is very simple that it is expectation half a kilo kilogram a kilogram should be there can be more than that so if you calculate accordingly you will see that this is better