Constipation is quite common in babys less than 1yrs of age No need to worry for that Give tummy times  frequently  in a day time Feed ur baby as per demand Burp properly at least 10 min or till baby take 4 burp Keep a watch on urine output Baby should pass minimum urine 6-8 times per day If baby is feeling discomfort and crying exessively then Need to do rectal stimulation, apply some drops of oil over motion area It will help If doesn't work then Need rectal enema for which u need to visit ur nearest pediatrician once

if the stools are soft, it is not constipation. since babies poop while lying down, they need to apply more pressure and they dont like it. hence the red face and crying. it should pass off in a few days or weeks. if it concerns you a lot, kindly consult with your pediatrician to rule out any other cause