This is a baby romper-style undershirt. All are 100% cotton. The two patterned ones on top are size 70cm. The two plain ones on the bottom are labeled size 60cm, but the size difference isn't significant, and I used them all from the newborn period. One of the plain ones has a small stain on the collar, which I hope you'll consider as a bonus. It's easier to put on and take off than undershirts with ties. They show a reasonable amount of wear.