What size of nipple shield should I use?
Nipple shields are classified by the width of the base of the cone and are usually available in widths of 16, 20, and 24 millimetres. Use the largest nipple shield that the baby can comfortably handle. Most full-term babies and their mothers do best with a 24-mm nipple shield. Generally, 20-mm nipple shields are recommended only for small premature babies and 16-mm nipple shields for very small premature babies. The smaller the nipple shield, the higher the risk of nipple pain and of the baby not getting enough milk. Some mothers with very large nipples need 28-mm nipple shields.