[File:Maternidad subrogada situación legal.PNG|450px|thumb|Legal regulation of surrogacy in the world: ]] A surrogacy arrangement or surrogacy agreement is the carrying of a pregnancy for intended parents. There are two main types of surrogacy, gestational surrogacy (also known as host or full surrogacy) which was first achieved in April 1986 and traditional surrogacy (also known as partial, genetic, or straight surrogacy). In gestational surrogacy, the pregnancy results from the transfer of an embryo created by in vitro fertilization (IVF), in a manner so the resulting child is genetically unrelated to the surrogate. Gestational surrogates are also referred to as gestational carriers. In traditional surrogacy, the surrogate is impregnated naturally or artificially, but the resulting child is genetically related to the surrogate. In the United States, gestational surrogacy is more common than traditional surrogacy and is considered less legally complex.