A nipple shield is a silicone tool shaped like a nipple which is applied over mom’s nipple as a barrier. They can be helpful for some women but not necessary for everyone. It’s best to avoid using one unless recommended by a lactation consultant or provider with breastfeeding training. This is because using one can have unintended consequences like reduced milk supply and shields need to be sized appropriately. Common reasons nipple shields are recommended include flat or inverted nipples, painful or cracked nipples, or premature babies who need extra latching support.