hii sir my baby age is 58 weeks but weight is 7kgs pls give any suggestions for weight gain

A. in this case I would definitely advise you to consult on nutrition is one because your child is quite underweight to me as per the age of the nutrition is would be able to give your correct guidance on the kind of food you should include into your daily diet that what is going to be good enough so take advice from a specialist in this area