For just about anywhere you travel, keep these precautions in mind.
Water-borne illness: Drink boiled or bottled water. Choose fruits and vegetables that have been peeled or cooked. Bring a diarrhea medicine, just in case.
Communicable disease: Wash your hands well after playing with or holding children at orphanages, and especially after changing diapers, of course. Since the local water may be questionable, bringing liquid hand sanitizer that doesn't require water is a great idea.
Rabies: If you are bitten or scratched by an animal, wash the area with lots of soap and water, and seek medical attention immediately.
Common sense: Bring all the usual medications you would need. And remember, all of the above are suggestions and cannot take the place of your doctor's advice for you as an individual.
Once you've made your pre-travel plans, it's time to start thinking about the return trip, and travel with Baby!