Chinese women Rui Cai and Cleo Wu gave birth to twins last month, following a successful in vitro fertilization. It wasn't simple.
Cai took two eggs from Wu, added sperm from a U.S. sperm bank, had them put in her womb at a clinic in Portland, Ore., then returned to China to give birth.
The lesbian couple is one of the first in China known to have used this form of surrogacy.
The birth is seen as a sort of milestone in China, which has become a more tolerant place for gay couples over the past nearly four decades.