One of my best friends and her DH couldn't have kids, so they fostered. They took babies at first, I think they took a lot over a couple years, usually for just a little while at a time, then a couple toddlers needed homes, and one thing led to another. They ended up formally adopting 3 of the little boys they fostered, and are happy to be parents. It's not easy, one kid was just diagnosed with autism (mild but still) and one has PTSD from his home life before (how sad is that in a 6 year old). The third kid tests at an almost genius level, so they got all kinds
They also tried to adopt a little girl, but the judge gave her back to her mother, after she had lived most of life with my friends. That was hard. But they find it so rewarding and it is so needed. Good luck.
Maggie