My boy baby when he was born was 3.4kg. But after 5 days due to jaundice as reduced to 3kg. Now my baby is 2 months 27 days old. His current weight is 5.4kg. Is it normal

A. What is better than normal your child has gained 2 kg on top of the weight from which we calculate so it is very good if you look at it 500 g minimum is considered good every month your child has gained better than that which is excellent