A 1996 study reported in Child Development found that all the children studied “reported positive levels of self-esteem, curiosity about their birthparents, and satisfaction with the openness situation” regardless of whether their adoptions were closed, semi-open, or open. What this seems to mean is that the child's sense of security in his adoptive family is more important than contact with the birth family. 

Sue Heinzman’s enthusiasm for openness was echoed by virtually every family interviewed for this story. Even Kim Felder, whose empty mailbox made her son so sad, would not have it any other way. Robbie is one of four children adopted by the Felders since 1987, all of them involved some form of openness. And Kim knows the pain of closed adoption firsthand: she placed her son, Jim, for adoption 24 years ago, reuniting with him when he was 18.
In all adoption searches, it is uncommon to find both the birth mother and father at the same time. A separate search, if desired, can be done afterwards for the father. Since males seldom change their surnames, and the mother might have additional information, it is usually easier than the initial search for the birth mother. In many cases, adoptees are able to do this second search for their birth father by themselves (or they try before paying for assistance).
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