The double-breasted body made of thick interlock knit, 100% organic cotton, is designed for the well-being of your baby: For premature, newborn and 1 month sizes, the body is tied with a lace to gently dress the baby, it fastens with pressure for the other sizes. All the seams are on the outside and the volume of the sleeves is widened to facilitate the passage of baby's hands. Each time you dress your baby you will take care of her skin. This body is 100% GOTS certified organic cotton.