Tiffany has traveled all around the world with her son, and, in fact, just got back from a solo trip to Nepal with him (he's six). Here's her reference book advice:
What altitude is too high for a one year old? How can you spot Dengue Fever in a toddler? What's the dosage of Cipro for a pre-schooler? "How to Make Parasitic Friends and Influence Tropical Disease" could be the title of this book, but instead they named it "Your Child Abroad: A Travel Health Guide" (Drs. J. Wilson- Howarth and M. Ellis) – an essential reference for anyone taking their child to an exotic location. Packed with practical advice, it also contains entertaining personal stories (they all end well!) with titles like "Electrocution in Lombok" and "Cyclospora – The Kathmandu Quickstep."