I say go for it!
I would not be offended at all!! I would much rather see someone sell their fufu's from me than have them sit in a box and not get worn. They are meant to be worn and if your girls no longer wear them or they don't fit, i don't see why anyone would have a problem with that. Just think, you will get some $ to buy MORE this way!!!
It's a great way for others to get some precious clothes for their babies if they are on a tight budget and can always use a bargain!!!
I only see it as a WIN/WIN!!