From BBCJiao Na and her husband Niu Jian-fang beat China's one-child policy by having quintuplets.
"What's your secret?" I ask them.
Niu Jian Fang stares ahead. Jiao Na laughs nervously.
"Difficult to say," she answers.
No-one here in Buffalo village [of Henan Province] wants to say it openly, but privately families admit they use fertility drugs [e.g. clomifene citrate capsules] to get round the one-child limit.
One woman says her parents-in-law put the drugs into her food to make sure she would conceive twins.
Because of the fertility drugs, this village has more twins on one single street than you would expect to find in the entire village.
Just down the road from the quintuplets' house, there is Lou Yuan Mei and her two-year-old twins, Lin Kai and Lin Da, dressed in identical orange jumpsuits.
A few doors down, Wu Xiaofang is happy to pick up and show off her baby twins, Jiao Jiao and Fei Fan.
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