Tougher controls on overseas adoption are expected after the Government indicated it would back a private member's bill to be published this week.
The bill would make it an offence to bring a child into Britain without prior approval, following concern over the abduction, sale and trafficking of children from developing countries and eastern Europe.
The measure would also enable Britain to ratify the Hague convention on inter-country adoption. Although Britain signed the treaty in 1994, it has faced criticism for failing to pass the legislation necessary for ratification.
Mark Oaten, the Liberal Democrat MP for Winchester, who will introduce the bill, said: "Almost five years is too long to wait and, with Government support, I am glad to have the chance to put that right."
Concern about inter-country adoption came to a head about 10 years ago with a number of cases involving Romanian children.