Top your diaper cake with the stuffed animal of your choice. A teddy bear is always a suggested option in instructions for how to make a diaper cake step by step, but you could choose something that coordinates with the baby’s nursery theme if you wish. For example, a stuffed monkey would be a good diaper cake topper if the baby has a jungle nursery theme and you want to make a safari diaper cake. Baby boy diaper cakes could include a pop and push toy car instead of a stuffed animal.