The story: Why should baby girls have all the fun with leggings? These long john pants are like comfy sweatpants with a lot more flair fitting snug to the leg. I like the idea of both baby boys and girls lounging in style and the buttons on the bum do the trick.The product: These were the natural progression of the long john bloomers. Made of soft stretch knit with a stretchy waistband and leg cuffs, they fit a bit closer to the body than bloomers but the stretch ensures that baby can still move and shake. The flap is purely esthetic and doesn't open (although I thought it would be interesting if it did). And, for those not familiar with long johns, the flap is for the back.SIZING:Absolute newborn (6-8 lbs) Waist: 11 inches0 to 3 Months (9-13 lbs) Waist: 13 inches 3 to 6 Months (14-16 lbs) Waist: 16 inches6 Months to 1 Year (17-20 lbs) Waist: 17.5 inches1-2 Years (21-26 lbs) Waist: 19 inches...and upPlease check your sizing carefully and let me know if you would like custom sizing.