This onesie is made using professional heat transfer vinyl that is adhered to the onesie using a professional-grade press machine. Material & Sizing: Heat Transfer Vinyl Design Applied To 100% premium cotton Gerber Onesie Neckline Is Expandable Making It Easy To Dress Baby Has Front Bottom Snap Closure For Easy Changing. Gerber Onesie Size/measurements: * 0-3 Months - 21-24 In. / 53.3-61 Cm * 3-6 Months - 24-26 In. / 61-66 Cm * 6-9 Months - 26-28 In. / 66-71.1 Cm * 12 Months- 28-30 In. / 71.1-76.2 Cm Sizing Tip* Gerber Onesies Tend To Run Small So We Recommend Sizing One Up. Care Instructions: *Wash Inside Out In Cold Water. *Dry Using Low Heat Or Air Dry. *Do Not Use Bleach, Fabric Softener, Or Harsh Detergents. *Do Not Iron Over The Design