Well, in last years census the population was actually lower than expectations. (it was 1.34 Billion, estimates are 1.38 -1.4 Billion)
People are just having less kids, regard less of policy. Are with most of the post-80s already qualify for second child, and many not going for it. People are urging the entire policy to scrapped since fertility ratio is heading below 1 in many locations and it seems there is no way for it to head north of 2 even if no restrictions are in place.