How do I position my breast shield assembly? Natalie March 20, 2017 23:54 Follow Center your breast shield over your nipple and press inward toward the breast for an air tight seal. You can also check out our product tutorial video. Related articles How many sizes of breast shield do you offer? Hands-Free Pumping How do I make sure my breast correctly fits the breast shield? Suction What if one of my nipples is larger than the other? Comments 0 comments Article is closed for comments.