Yes, I do know of few. Of the ones I have in my spreadsheet/database so far, here’s what I have:
by myrna123
Weight Worth Bearing (hurt/comfort first, then kids in epilogue)
Cookies (short sequel to Weight Worth Bearing)
by @tinsnip
(I love this set. There may be more I might have missed.)
by Aurora Nova
Altering Course
(They don’t exactly adopt kids but create a sort of blended family including Cardassian kids.)
by JA Ingram
This EPIC series (over 300,000 words) includes, among many other elements, adoption as well as an orphanage. It’s so long, though, I warn you, you may want to pace yourself :) And it’s while before you hit the kids, but definitely they are built out characters. (Eventually I will post a review of this.)
There are definitely more, some sentimental, some not. I am building my list and as I do, posting review. It’s going to be a long time until I post even the ones before I started this blog.
Wendy