They finally won custody of the embryos last year and, since surrogacy is illegal in China, managed to drive to Laos and find a surrogate mother using an underground surrogacy agency.
The boy was born in December in a hospital in Guangzhou, China. His name is Tiantian, or "sweet".
"Tiantian's eyes look like my daughter's but overall, he looks more like his father," Liu's mother, Hu Xinxian, told Beijing News.
The grandparents have not decided how to tell Tiantian about his background. For now, they have decided to tell Tiantian his parents are overseas, until he's old enough to understand his background.
"This boy is destined to be sad on his arrival into the world. Other babies have their fathers and mothers, but he doesn't. We will definitely tell him in the future. How can we not?" grandfather Shen Xinan said.