You can buy somerhing called "exersaucer" or something like that, itīs like a walker, but it stands in just one point,also, thereīs something you hang on the door frame, where you put the baby and he starts to jump, like baby-bungee...I doīnīt know the name, but it keeps the baby very busy for about half an hour, and they blow a lot of steam in the process.
Hope it can help.
Victoria