Very good, the problem is that even in China the number of female births may have been greatly obscured by the hiding of female births. Under the old One Child rule, it was recently rescinded, the births of some children were hidden. You could not be charged if no one knew that you had a child. From the second source:
"When sex ratio began being studied in
China in 1960, it was still within the normal range. However, it climbed to 111.9 by 1990
[9] and to 118 by 2010 per its official census.
[49][50] Researchers believe that the causes of this sex ratio imbalance are increased female infant mortality, underreporting of female births and sex-selective abortion. According to Zeng et al. (1993), the most prominent cause is probably sex-selective abortion, but this is difficult to prove that in a country with little reliable birth data because of the hiding of “illegal” (under the
One-Child Policy) births.
[51]
These illegal births have led to underreporting of female infants. Zeng et al., using a reverse survival method, estimate that underreporting keeps about 2.26% male births and 5.94% female births off the books. Adjusting for unreported illegal births, they conclude that the corrected Chinese sex ratio at birth for 1989 was 111 rather than 115.
[51] These national averages over time, mask the regional sex ratio data. For example, in some provinces such as
Anhui,
Jiangxi,
Shaanxi,
Hunan and
Guangdong, sex ratio at birth is more than 130.
[52][53]"
That being said, I would have no problem on banning selective abortion. The problem is proving it in the first place.