Amazon size chart is not specific to our brand. Please see Description for dimensions on t-shirts Screen printed design on Cotton bodysuits for comfort and softness. Gift Set Includes 2 bodysuits. Heather Gray bodysuits are 65/35% cotton-poly blend. The graphic design is a registered copyrighted design. Infringing companies will be prosecuted. We have many shirt twin designs available on amazon. Great for Christmas and Birthday Gifts. Click on our brand name above the title to see our other shirts and shirt sets including onesies and toddler tee designs. Please allow 1" tolerance on length and 1/2" tolerance on width. 0-3 Mo (AKA Newborn) : Length 14.5" - Width 7" 3-6 Mo : Length 15.25" - Width 7.5" 6-12 Mo: Length 16" - Width 8.25"