Colton has had some problems with constipation as well. I've had him on juice since about 3 weeks and he has had his formula changed three times. When he torn himself (has happened once), he was put on medication to soften his poo. Once they tear themselves, it is going to retear every time they poo unless it is soft, thats what my pedia said.

Sammi-blood in stool is a big flag something might not be right-not trying to scare you I just know what the doctor told me to watch out for. If you are able you should take him to a gastro doctor. On a postive side, 16lbs is a great weight for his age so its alwaysa good sign he is gaining weight