If you ever wondered what James P. Sullivan looked like when he was small, then you can see for yourself with this Monsters Inc. baby Sulley costume for toddlers. Remember, you can always alter your costumes if you are not totally satisfied with it. If you happen to be very good with the sewing machine, or know someone who is, you can always change the costume to fit your needs. For this costume, make sure that the two little horns at the sides of the head are visible from the front. Be sure to include the purple spots all around the body and you’re done!