Oftentimes the birth and adoptive parents will sign a Post-Adoption Contract (sometimes called an Open Adoption Agreement), putting in writing any promises regarding contact after the adoption is finalized. Even in those states which do not expressly have laws in this area, these agreements can usually be prepared if the parties desire to formalize the agreement. In an increasing number of US states, courts will find these agreements legally enforceable, as long as they serve the best interests of the child. It is not unusual for these agreements to be more like "handshake" agreements, although they offer less protection to a birth parent if the adoptive parent's promises were not honored.
If adoptive parents have chosen closed adoption as a preference, they may feel closed adoption allows them to parent without interference or worry that an open adoption would confuse their child. If birth parents have chosen to keep the adoption closed, the benefits will also be tied to the reasons for this choice. The placement may be due to wanting the child out of a bad situation, and the closed adoption allows for security. If the child is a product of sexual assault, closed adoption may benefit the privacy and emotions of both the birth parent and child. A birth parent may also choose to keep an adoption closed because an open adoption would be too difficult emotionally. A closed adoption may be viewed, in this case, as an opportunity to try to move on.
Open adoption has slowly become more common since research in the 1970s suggested that open adoption was better for children. In 1975 the tide began to change, and by the early 1990s open adoptions were offered by a majority of American adoption agencies. Especially rapid progress was seen in the late 1980s and early 1990s - between 1987 and 1989 a study found only a third of agencies offered fully open adoption as an option; by 1993 76 percent of the surveyed agencies offered fully open adoptions. As of 2013, roughly half of US states consider them legally binding, however contact in open adoption is not always maintained.
But closed adoptions meant that birth parents were left wondering if the child they placed for adoption had grown up healthy and happy with a loving family. They meant that adoptees had no medical history to rely on, nor any answers about the circumstances leading to their adoption. This lack of information made it difficult for birth parents and adoptive families to contact one another if they wanted to meet later on in life, and it made it more difficult for adoptees to form a positive self-identity.