Yellow clothes

I'm unpacking K's old baby clothes and realizing that most of them are covered with yellow stains. I think the stains have deepened over time -- I'm sure I wouldn't have saved all those clothes if they looked as bad as they do now. So what do I do with them? The alternatives seem to be: (1) use them -- babies are constantly messy anyway; (2) donate them -- probably nobody in the U.S. would want them, but I know Goodwill and places like that have recycling programs that pay them for recycled clothing; or (3) put them in the rag bag. Any advice?