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 Suction What if one of my nipples is larger than the other? Do you offer milk storage bags? Comments 0 comments Article is closed for comments.