This bottle is designed for feeding small, newborn animals such as kittens, puppies and hamsters. The bottle markings help to gauge the appropriate amount of formula for each feeding. The tiny nipple is also designed to fit tiny animals' mouths. Also for orphaned animals. DirectionsTo prepare the new nipple for nursing, you must puncture the tip with a hot needle or cut a small cross in it using a razor blade. Start with a small hole or cross cut and adjust the opening depending upon the need.