All bottle reared babies need good nutrition properly adminstered. PetAG nurser bottles have been designed to fill this need. Conveniently marked in tablespoons for accurate feeding. One tablespoon equals half fluid ounces or 15 ml.The nipples will need to have a hole made in them by using a hot needle or by cutting a tiny "X" with a razor blade. The size of the opening will regulate the formula flow.Kit comes with a 2 or 4 ounce bottle, 3 different shape nipples to simulate those of different animals, and a brush to clean your bottle and nipples. May be used for puppies, kittens and other small animals.Sizes: 2 oz. (60 ml.) or Size: 4 oz.