Go south through a big intersection (the one on Xiaolin Road) from the place where the health certificate was originally issued, and continue to go south. After crossing bridge opening, walk about 200 meters to the east of the road (it says to apply for a health certificate). You can take bus 827, 829, 840, Daxing Xin 1 and Xing 2 1 and get off at Yijingyuan.
The Maternal and Child Health Hospital seems to be successful, and now it has moved to the original position of Huangcun Central Health Center. It's behind Xingfeng Street.