Philips Avent Nipple Shield Medium are designed to breastfeed when you are experiencing latch on challenges. The ultra-thin butterfly shaped nipple shield allows breast contact for baby and helps to continue bonding as you breastfeed. Thanks to the shape not only the nose is in contact with the breast but also the chin allowing the baby to smell mom's scent and touch mom's skin. For mothers with flat and inverted nipples and babies with weak sucking technique or oral anomalies, the nipple shield can provide a nipple shape for latch on, keeping and maintaining a protruded position during baby's feeding pauses. If mom's milk flow needs controlling or the baby lacks strength, nipple shields are also a great support. The three holes in the tip of the shield can helps to rate the breastmilk flow for the baby in case there is an oversupply of milk. This way the baby can drink at his own pace in case the mother is experiencing an overactive let down. This nipple shield is available in medium sizes to better fit your breast. To find your size, get comfortable and place one of the punched rings over your nipple. Rotate shield clockwise and guide your nipple into the tunnel. Then stretch the shield’s base around the areola. If there is 2mm of space between the nipple and silicone, this is the right fit. Tip: Size are based on the mamilla and not the areola. Just position the shield over the center of your nipple to make sure your baby can properly latch on the entire areola. Enjoy bonding with your little one while protecting your nipples.