Re: A couple without a child…
If it is possible the couple’s siblings can give their child for adoption. I have seen two such cases in my life. One was with my teacher her sister got pregnant just to give her child to her and she gave the baby boy away right after he was born. Another one is a family friend the wife’s brother had a baby just to give to his sister for adoption and the baby girl was given away right after the birth. I knew someone whose sister was given away for adoption to her phupo but in this situation the phupo was childless and the biological parents had 4th girl and they were very much okay in giving away a baby girl.
Personally I can never do so much for anyone meaning I can never give away my child but some people do that and this way the adopted child is also blood related to the couple who are adopting.
Otherwise I believe that a baby comes from naseeb changing wife won’t do anything agar Allah nay aulaad deni hai to woh kisi bhi auraat sey deysakta hai.