Baby spoons and sippy cups will come in handy. Some older babies may have lost their ability to suck, and sippy cups with straws may not work. It's a good, lightweight insurance policy, although it is a bit bulky. They can also be used to carry a diaper until a waste container is found. Lightweight and small, the uses can be endless.
Children typically love music.
If you are adopting a toddler or older child, consider bringing a tape player that the child can operate along with a few tapes. The Teach Me Foreign tape is available through most bookstores and has been a proven favorite with both children and parents. With toddlers and older children, save a couple of special toys as a surprise gift for the flight home to help combat boredom. It's easy to over-do your preparation for bringing home a child. Think necessities over preferences, as the more you carry over to the foreign country, the more difficult the journey can be.