【Pigeon Breastfeeding Realization Nipple for Baby Bottle】 ◇Used, M size, set of 5 ◇For babies around 3 months old My daughter used these in rotation for about 2 months, from 3 to 4 months old. I sterilized them each time after use, and they were also sterilized before storing. If you don't mind used items, please consider purchasing them. ⭐︎