I had to wake my DS up for his feedings. He had sever reflux, weight gaining issues, and was labeled "failure to thrive". He had many hospital stays as well. I had to feed him every 2 hours for about 7 months! We had to thicken his formula, add calories to it and keep him propped up after feedings.
Same here, except for the failure to thrive and hospital stays. I would say that about 80% of what he ate came out, it all suddenly stopped at about 7 months old, just like the doctor told us. He's almost 11 moths old now, and there's no need to wake him up to feed him, he naps in between meals.