Engineered for easy. The nipple was designed to only have a pullback when it takes a real tumble to the floor or the ground. Otherwise, if it falls on the baby's chest or crib, the nipple will stay extended & ready for baby. You can push the nipple until it locks into place, but don't over push it. Just until it doesn't pop back. Want to do it with one hand? Shimmy the nipple with your thumb while your forefinger & middle finger keeps the mouthguard in place.