Fits standard doorways that are 3 to 6 inch thick with firmly affixed door trim at least 1/2 inch wide • Jumping promotes fun and healthy activity for baby • Framed seat fully surrounds child • Fully enclosed spring prevents child's fingers from touching • Adjustable straps allow you to adjust to the baby's changing height and weight • Fits standard doorways that are 3 to 6" thick with firmly affixed door trim at least ½"wide • Jumping promotes fun and healthy activity for baby •Framed seat fully surrounds child •Fully enclosed spring prevents child's fingers from touching while also preventing dirt from collecting in the active spring •Adjustable straps allow you to adjust to the baby's changing height and weight