my baby born at 1.8, kg and now her weight is 4.3 and she take feed at 4-5 hours gap is this ok she is 2 month old

A. Which is better than a normal weight gain that your child is having right now a minimum gain is 500 g to 1 kg in a month your child has gained more than 2 kg in two months which is exceptionally good despite of born with such a low weight gain