For temporary use when breastfeeding with sore, cracked or flat nipples. Help with latch-on difficulties. For use under professional care only while breastfeeding the baby. Not to be worn  between feedings. Unique cut-out at the base of the shield allows more skin-to-skin contact between mother and baby.Extra Small - 16mm. Made of thin, soft silicone. Neutral in taste. Autoclavable.