Lauren Madison Baby-Boys Newborn Baby Boy Christening Baptism Embroidered Vest. 100% Polyester Dry Clean Only The Pants have an elastic back for best fit Fabric covered buttons on front 0-3 Months fits birth to 12lbs 6-9 Months fits 12 1/2lbs to 16lbs 9-12 Months fits 16lbs to 20lbs 18 Months fits 20 1/2lbs to 23 1/2lbs 24 Months fits 24lbs to 27lbs