I think the teenage mom would be the best bet, most teens would love to give their baby a nice home rather then abort. And they aren't ready for a baby themselves, be wise though once they have the baby things sometimes change, they get attached.

 You may want to put a ad in your local paper looking for a sarroget or even better a teen mother that is looking to give her baby up adoption offer to meet her and her family being to do a background check to show her who you are if you live in a small place you could try advertising in the biggest metro near you good luck for those who have love to give god will bless  there are lots of children looking for a good loving home there are also children in other countries that you can also look into