How old were the kids when they started showing interest in rattles?

How old were the kids when they started showing interest in rattles? My little one looks at them, holds them if we put them in the handle, but doesn't shake them or look at them... He prefers to chat with us instead. And it's also normal that he hasn't flipped over yet, he's still young, as soon as I read all of them, they flip over and almost walk ??. Lying on his belly, he slowly raises his head, lying on his back, returning to the backrest.