A 0-6 month old baby is busy exploring and discovering their hands, their feet and their senses. The best toys for babies this age are those toys that encourage this discovery.
Toys for looking, listening and touching are all great choices. Babies love bright colors and the contrast of black and white.
Toys that are soft, lightweight, easy to handle, and produce some kind of sound are your baby's best bet. If the toy is washable, that's a plus!