Experience based on travelling around south India and SriLanka intrepidly (no package - just flights to bangalore with open return ticket)
Sunlotion: EUCERIN Junior is fab
plenty of light coloured tshirts, muslins (for bandana, wipes, change mat), and nappy rash cream such as metanium or bepanthen if you go somewhere hot, and remember nappies may not be readily available, so prepare for early potty training.
Careful with mosquito repellent, your child may rub his face, then his eyes....
If you go anywhere you need malariaprofylactics and travel with small children, reconsider, it may take away your childs apetite.
take rubber bands, they are perfect for a lot, including tying the mosquito net to the sheets to make sure it stays in place.
If you go somewhere very hot and exotic, note that the roads may not necessarily accomodate pushchairs, as most local people carry their kids around, even when shopping.
You CAN "sterilize" dummies in a travel kettle.
DO bring your own sterile needle kit, this is vital! (as local needles came dripping in water as it had been rinsed after the last patient ... - this was in Morocco)
DO NOT trust a tour operator that says "you can buy visa on the border" CHECK with with the embassy/consulate of the country you intend to visit, especially if you come via a different country through rather unusual means (my husband was arrested on the border between Jordan and Egypt when we decided to take the ferry across from Acquaba to Port Said, in was nearly deported home to native country with all our money AND my passport)
DO carry your own passport and tickets, do not let your partner take care of yours, and vice versa, you never if and when you get separated, or if one of you is arrested....
CARRY fresh lemon around, and add to water when having meals, as the antibacterial agents in water prevents food poisoning to some degrees, and for the same reason, if going to very far off places, take a hipflask with shot of vodka or cognac.
Avoid well known american burger joints like the plague, it is familiar food to you, but not necessarily to the person who stores and cooks the food. Eat in local places where the locals eat, and the food is sure to be fresh and prepared as it should. The only times we got tummy upsets were when we were eating in establishments foreign to the culture we were in.
French Chicken soup is Neither French nor Chicken if you are in Egyp.
will probably think of more later.