So here s a little background... I started out EBF. LO was 7 pounds at birth. Two days later when we took her home, she was 6 pounds 4oz. Took her in to the ped for her 1 week checkup, she was 6 pounds 10oz. At her 2 week appointment, she was 6 pounds 14oz. Went in a week later for a weight check, she was 7 pounds 1oz.  At this point, we began supplementing with Gerber Soothe. I was already struggling with a very low supply, so adding formula caused it to completely dry up. No matter what I did, it wouldn t come back. I have since been diagnosed with IGT, which explains my issues with supply and the low fatty content of my milk. Gerber Soothe caused LO to become severely constipated. While EBF, she pooped after every feeding, soft, mustard yellow and seedy. After we started formula, it was a week before she pooped and when she did, it was rock hard balls. So the ped changed her to Gerber Gentle. A few days later, she had her last poop that she s done on her own.  She is now 2.5 Months old and hasn t pooped on her own without rectal stimulation since she was approximately 1 month old. Her tummy gets rock hard, she pulls her knees to her chest and she strains for hours until she s screaming in pain. She can t get the poop out no matter what. Until she s stimulated. Then soft poop happens no problem.  She sees a pediatric gastroenterologist. He first put her on 3 ml of milk of magnesia twice a day. Made the poop softer but she still couldn t get it out. She s now on lactulose (prescription sugar solution that is used as a laxative). It s been a week of lactulose. Poop is liquid and full of Pea - sized and larger curds. She still can t get it out. What could this be?