100% Cotton - Funny Cute Baby Onesie Unisex - Very Comfortable And Soft Material - To Keep Your Baby Feel Like He Still In The Stomach. We have many other designs available on our amazon including t-shirts, click on our brand name above the title to see our other designs Dimensions: 6 Months: 8” Width 15” Length 12 Months: 9.5” Width 16” Length 18 Months: 10” Width 18” Length