We thought soy was going to work, but the constipation came back. We took him back to the dr and she said it sounds like reflux. He's been on Zantac for 2 days and cries much less, and sleeps more. Although, he's still eating every 3 hours around the clock, at least he seems to be happier. His naps are a little bit longer during the day, but he still doesn't sleep too much during the day. He's a great sleeper at night, minus the waking to eat every 3 hours.
He's on Similac Sensitive now, which is his 5th formula. Whew!