Practical Meets Fashionable Smart Bottoms one-size, all-in-one diaper is available in six exciting colors with accent colored snaps and three new, fun prints. The trim design will fit under most clothing, no need to buy the next size up in clothing just to fit over the diaper. Our one-size diapers can be used from birth until potty. Only the Best for Your Baby We use only 100% certified organic cotton inside our diapers. Your baby's skin will not be exposed to harmful pesticide residue or petroleum based fabrics when you use Smart Bottoms. The natural fibers will reduce, if not eliminate diaper rashes as well as promote early potty learning.