That's pretty much all you're going to find.
Mao did encourage population growth in the 1949. However it seems that this might've been a misunderstanding (and he was just basically spouting shit to boost morale.) By 1953 they started trying to curb population growth.
If you need a legit source, this should do well enough:
http://www.ncbi.nlm.nih.gov/pubmed/12281752