What do you recommend to cure constipation for a 7 week year old child?

Breast or formula ?: Breast fed infants can go a little every feed or overflow a diaper once a week. If it is soft when they go i don't worry about it. Formula fed babies usually have a more predictable pattern of daily stools. If stools are getting hard, i often try full strength prune juice, 1oz once or more/d.Takes about 3d to get things moving.