My baby at time of birth is 2.6kgs. Now it's her 8 th week and when checked weight during 45 days vaccine it's 4.2 kgs. is it ideal

A. Better than the ideal weight that you are expecting to see the weight is actually going good to minimum expectation is 500 g in a child gain better than that’s why I can assure you that the child is taking better weight than the ideal weight so no need to worry about it it’s going very good