Yes but in the 80's (I got this first hand from one of my staff) they tested each female who already given birth, annually. If they were pregnant then they were forced to abort. Did not matter if the fetus was weeks old or 8 months old. Children who managed to be born to a one child family were taken by the Party and their lives terminated. Her husband was one of 3 sons. He is the 2nd child. His mother was determined not to terminate so she never left the house and evaded the Party when they came door knocking. Both he and his younger brother were hidden in a cupboard and eventually driven to rural China to be raised by an Aunty on a remote farm. He was home-schooled bc back then siblings could not get an ID card. No ID card, no school. There was an amnesty of sorts about a decade ago and the forgotten children received ID cards.
One of my clients is Chinese, yet has a soviet surname. Her daughter explained that she was born to a family who already had a son. She was smuggled over the western border and given fake documents.
Do you really think that it would work in the western world ? Also how would this be policed in Africa, Asia and South America ?