I personally don't have any experience but do know of some people who do. My previous sitter's mother does foster care (her own children are grown and out). She is in her lat 60's now and has had the privelage of adopting 4 siblings from foster care. She raised them from babies (the oldest is now around 15 and the youngest around 8) and the system was going to separate them to get them adopted but she wouldn't have it so she adopted all 4 of them. She still does it now and gets phone calls in the middle of the night to take a child. You have to have a strong heart if you have to give the child up and you have grown attached. She always has extra clothes on hand in all sizes, has lots of toys, and lots of love.. I always wanted to do it but I work full-time and don't know if I could deal with getting a child, getting attached, and then having to say goodbye. Whatever you decide, good luck and please let me know how you make out..
There are too many children in this world and not enough caring parents to go around..