What is the difference between registration and adoption?

These are two different situations. The registration of dual maternal or paternal filiation in the civil registry of birth is about a child conceived in a same-sex family. This means that the pregnancy was the result of a joint decision of the couple. Adoption, on the other hand, applies in the case of a child that is the product of a previous relationship. In order for the current couple to establish a bond with the child, they must go to the ICBF to apply for a joint adoption, according to the Constitutional Court's decision C-071 of 2015. In other words, the registration in the civil registry of birth of both mothers or fathers only applies to those children conceived within a couple who jointly decided to have the child, since otherwise it is not possible to apply the presumption of filiation.