Standard Nipple Protectors (2 Pack) by: Avent. These nipple-protectors guard sore or cracked nipples during breast feeding. They are butterfly shaped to allow your baby more contact with your breast. Your baby can still feel and smell your skin and continue to stimulate your milk supply whilst suckling, and will return more easily to the breast when nipples are healed. Avent nipple protectors are made of ultra-fine, odorless silicone.