sir my daughter is 4month 12day old .she is very lean .Her weight is 6kg but she is slim .please give some suggestion

A. You have to evaluate the weight of the child on the basis of the birth weight by completing the age of six months it should be double the birth weight or more than double the birth day so looking at the current age and the weight of the child I was it is very good you should not be worried about the weight of the child