What are the effects of anonymity and secrecy on the welfare of the child in gamete donation?

A perennial concern when using donated gametes in infertility treatment is the effect on the child and his/her family of the traditional anonymity of the donor, and of the secrecy of the procedure. As all involved, from potential parents to carers, wish to maximize the 'welfare of the child' born of gamete donation, conflicting attitudes, sometimes translated into diverging legislations in Europe, are analysed. In the face of the lack of evidence on the consequences of secrecy or openness, it is concluded that future parents are best placed to decide on this matter for the potential children.