Mercy is said to be bonding with her new mother before the family flies to New York.
Mercy arrived in London on Friday after an overnight flight from the Malawi orphanage where she had been living.
One June 12th the Malawi Supreme Court allowed the singer to adopt the child after a lower court had ruled Madonna would not be able to adopt her because Madonna wasn’t a resident of the Malawi.
Rights groups have accused the Malawi government of giving preferential treatment to Madonna and say this ruling will encourage other foreigners to try to adopt orphans from the southern African country.
Mercy will join her new sister and two brothers.
David Banda, who’s three, was also adopted from Malawi in 2006