Even as fertility has declined in China in the last several decades, t
he first and second birth intervals have become shorter over time and
the probability of having a second child has increased since the late
1970s. This increase in the probability of conception seems to be cont
radictory to the Chinese government's birth planning strategy which ex
plicitly stresses timing and parity. Using retrospective survey report
s from 1985 in Hebei and Shaanxi provinces, the study explored this pa
radox. The study revealed several findings: (1) government interventio
n, especially the 'one-child' policy of the late 1970s, had a strong,
unexpected influence on early conception in China; (2) the timing and
probability of having a first birth were associated with macrosocial f
orces. and familial relationships; and (3) the timing and probability
of having a second birth were associated with biosocial, familial as w
ell as macro-social characteristics.