Now that Noah's a bit older (four months), he's become a lot more social. Now, if you try to, it's pretty easy to make him laugh and smile. He'll grab for toys and interact with them. Sometimes, when he's having too much fun (usually from jumping), he'll spit up. Initially, I was a little worried, but after a few times, I noticed that it didn't even phase him and more often than not, he'll continue smiling and laughing away.