According to Chinese law, pregnant or nursing women can serve their sentence outside of prison under local authority supervision.
source https://www.ndtv.com/world-news/chinese-woman-gets-pregnant-three-times-in-4-years-to-avoid-5-year-jail-term-9118469#publisher=newsstand
source https://www.ndtv.com/world-news/chinese-woman-gets-pregnant-three-times-in-4-years-to-avoid-5-year-jail-term-9118469#publisher=newsstand