Yes these are for children but honestly I don't want just a bum in a block and I know others are the same way. I do know each there own as well as to pre wash or not. The last swap I was in I can't tell you how many complained about it. So sense there is so many out there that would rather fussy cut that is what I choose. I never pre wash my fabric for I have never had a problem as to some wash everything that comes through there door. I don't have a problem with pre wash fabric as long as you don't mind getting back not pre wash fabric. I personally don't wash it before hand.