OOPs! Sorry, Sugarfamily. I just reread my post and realized that I did not directly answer your question about whether the adoptive child would ultimately reject the adoptive parents and want to go back to the birth mother. I think this is a very common fear for adoptive parents. Friends of ours who were considering adoption asked my husband the same question. He replied that he could not speak for everyone, nor predict the future, but that he had always considered his parents to be the people who raised him. (keep in mind that his adoption was closed)
Our newest family members - daughter age 7 and son age 3, have only been with us for a month. They speak to their BP on the phone once a week. There has been no crying or "I wish I was with you" when they are on the phone with her. They tell about riding their new bikes and going to the park and making new friends. The three year old sometimes asks, "I see you tomorrow?" But I think the 7 year old has a better understanding. They did already spend some time away from the BP, in foster care. Also, since being back with the BP, I think they moved around alot, living in several less-than-ideal places.
One of the beauties of open adoption is this...When I had to chase down the 3 yr old in Target, after he had run away from me for the second time, I told him he had to ride in the cart. He wouldn't hold my hand, so I had to carry him. While I did, he screamed, " NO NO NO! I'm gonna tell my mama on you!" I got several strange looks from other customers, who I thought might suspect me of kidnapping. Then I told the 3 year old that he was welcome to tell his BP all about it when we called her on the phone on Sunday after church. I said that I knew she would tell him that he should listen to me, Mama Sally (we refer to the BP by Mama and her first name, also.) A 3 yr old moves on to the next thing pretty quickly, and he has not once remembered one of these incidents by the time of the Sunday phone call.
Hope this helps! God Bless You!