Nutrical or Nutristat is great stuff but is more sugar than anything. A bit of protein with the Nutrical helps my babies when they get hypoglycemic. Chicken or Turkey baby food (yup, real baby food, like Gerber) works great and it isn't rough on their little digestive systems. It is also easy to feed to them with a syringe. Plain yogurt is another light protein that can help stablize the blood sugars.
Good luck with your new baby,
Teri
