my baby is 20 days old ...and is suffering from stomach ache and constipation... what to do

{"page_type":"question-detail","item_id":"152274","user_id":0,"item_type":"question","item_age_group":1,"item_corner":4,"guest_access":1,"item_multiple_age_groups":[1],"ns":{"catids":[17,10,26,15],"category":"family and parenting,health and fitness","subcat":"uncategorized,babies and toddlers,women's health,pregnancy","pstage":"ag1","language":"en"},"pageLang":"en","pageCharset":"en"}