Babies are definitely quick learners, and you definitely do not have to teach them how to be bad, they have that nature in them already right from birth. After all, we do not need to teach a child to lie before they tell the first lie, do we? And since babies love to play, having a rattle is a way to stimulate their mind through colors and sound, and you might as well make a meal out of the photos of your little one with this $9.99 Buff Baby Dumbbell Rattle. It certainly looks as though your small kid is going to grow up to be a bodybuilder, as junior works out to perform multiple sets. Each Buff Baby Dumbbell Rattle measures 5.5” in length and 2” wide, and does not contain any phthalates or BPA, making it safe for baby.