Feeding Issues:
Advice from Nutritionist for underweight toddler/preschooler
Ellyn Satter - articles and books on feeding issues
Many articles on nutrition on Dr. Greene's site
WHO Growth Standards
Children's Nutrition Guide
Allergy Issues:
What Every Parent Should Know thread
Emergency Medicine Bag for Kids with Food Allergies thread
Parents of Allergic Kids thread
Food Allergies and Public Schools thread