This is a set of 4 baby short undershirts✧︎*。 My daughter wore these when she was a newborn! All sizes are 50-60. Made of 100% cotton, so you can use them with peace of mind even for newborns✧︎*。 Although there is some wear and tear, there are no noticeable stains, so I think they can still be used. I think you'll need a lot of these during the time when babies spit up a lot, so how about it? (*ˊᵕˋ*)