Dress your little one in style with our adorable Merry Grinchmas Onesie ! This Grinch-inspired Christmas Onesie is made from soft white organic cotton, perfect for keeping your baby comfortable all day long. Available in both long sleeve and short sleeve options, it's a must-have for the holiday season 🎄✨ Available in sizes ranging from newborn to 24 months. These white 100% organic cotton Onesies will be either Gerber or Carters brand, depending on the size you choose. Size chart gives sizing for both brands with Gerber using age ranges for Onesies that are for babies aged 0 to 9 months (0-3, 3-6, 6-9). Carter's uses 3, 6 and 9 months rather than 0-3, 3-6 and 6-9. Sizes 12 months through 24 months will be the same for both brands. Size Chart: Short Sleeve Sizing: Newborn - 17-21 in./ 5-8 lbs. 0–3 Months (For Carters - 3 Months) - 21-24 in. / 6-12 Lbs. 3–6 Months - (For Carters - 6 Months) - 24-26 in. / 12-16 Lbs. 6–9 Months (For Carters - 9 Months)- 26-28 in. / 16-20 Lbs. 12 Months - 28-30 in. / 20-24 Lbs. 18 Months - 30-32 in. / 24-28 Lbs. 24 Months - 32-34 in. / 28-32 Lbs. Long Sleeve Sizing- Newborn - Up to 21.5 in. / 6-9 lbs. 3 Months (Gerber 0–3 Months) / 21.5-24 in. / 9-12.5 lbs. 6 Months - (Gerber 3–6 Months) / 24-26.5 in. / 12.5-15.5 lbs. 9 Months - (Gerber 6-9 Months) / 26.5-28.5 In. / 15.5-21 lbs. 12 Months - 28.5-30.5 in. / 21-25 lbs. 18 Months - 30.5-32.5 in. / 25-28 lbs. 24 Months - 32.5-34 in. / 28-30 lbs.