Hi, I have a 3 week old who is formula fed and usually does a poo every other day but we are now on day 3 and he still hasn't had a poo. For the past couple if days he hasn't been his self, throughout the whole day he is bringing his legs up in pain and going red in the face as if he is forcing something. And when I put him down he cries hysterically but stops when I cuddle him. When he does usually poo the consistency is normal so I'm not sure if he is constipated or if it is something else. Any help will be gratefully appreciated 