The magnetic footie features magnetic fasteners and no over-the-head design. Perfect gift for new parents and a must-have staple for every baby's wardrobe. *NB & 0-3M sizes open from neck to upper thigh and have mitten cuffs.*3-6M sizes & up open from neck to crotch with a roomy seat for easy diaper changes. *9-12M sizes & up follow tight-fitting standards and are meant to be snug. Order one size up if your child is on the mid to high end of our size chart.