What is the best formula to use for a 7 week old that struggles to pass stool. we have tried a few and our son is still in pain and crying whenever he passes stool. his stool is currently a bit hard too. ?

Adequate feeds: It is important to avoid dehydration which can present as dry diapers, dry lips as well. Bottle feeding is associated with a different less frequent pattern than breastfeeding. Burp the baby mid and after the feeding and if he still seems hungry offer more formula. Four oz of sterile water in 24 hours may also be provided. Follow up right away for blood, mucus, pain. He will be due for vaccines.

Any they will take: Early infancy is marked by weak/flabby belly muscles which makes them often use their fussing/breathing muscles to push food along or out. Some fuss more than others & it likely bothers you more than them. Full strength prune juice can be added to feeds 1 oz o ne to three times a day to soften their poop.