I have paper towels in my trunk, facial tissues, napkins and baby wipes. Leave the beeping, banging types at home. And always, always schedule home shopping around a young child's nap. Sometimes the child is great, then we keep looking at houses. But if the child becomes distracting, I keep a tour down to two or three houses.
Babies are great.
If they fall asleep, you can just bring them inside in the car seat. The older kids are beginning to understand the process of home buying, and genuinely are intrigued with looking at other people's houses. But the middle ages are tough. So, I ask parents to let me know ahead of time if the kids are coming. Nemerovski also suggests that parents sit down and talk to younger children as to why they will be walking through several homes.