Bouncing baby
Your baby can now support some of his weight on his legs, and he loves to bounce. What’s more, he’s probably able to sit unsupported (which frees his hands for exploring) and pivot to reach a desired object. He may even be able to get into a sitting position from lying on his stomach by pushing up on his arms.
Exploring with his hands
By the time he’s about 6 months old (though sometimes it takes a little longer), your baby’s hand control is developed enough that he can rake an object toward him. Once he’s learned to grab a toy, he’ll start to practice moving objects from one hand to the other. He may also discover that letting go of something is as much fun as picking it up. Once he understands the concept of cause and effect, your baby’s world will become more interesting — and yours a good deal messier.