Thank you for your query,
Continue exclusive breast feeding till the completion of 5 months and from 6 months onwards home made or commercially available infant solid complimentary feeds can be started to meet the hunger of the child.
Infants may pass stool once in 4 to 5 days and it is not considered as constipation
. But if the stool is hard, like hard pellets and having discomfort and crying with pain while passing stool then we can say child is constipated.
Weight is good.
Hope i have answered your query.