A baby’s vision isn’t fully developed at birth, so it can only see objects within 8-12 inches away. That’s also why babies love the type of bright, contrasting colours we use in our products.
The same rule can be applied to sounds, since babies hearing is so sensitive, new sounds will spark both smiles and giggles.
At about three months, babies will start using their hands to explore different objects. Putting things in their mouths is also something they love doing, allowing them to discover new tastes and textures.