It may also be information a birth relative has asked to be kept, such as correspondence from the birth mother about the circumstances leading to the child's placement for adoption.
Gall hefyd fod yn wybodaeth mae perthynas geni wedi gofyn am iddi gael ei chadw, megis gohebiaeth gan y fam eni am yr amgylchiadau ar arweiniodd at leoli'r plentyn i'w fabwysiadu.