How about just giving the mother an injection to stop labour? Common enough & works in most cases.

Miss Capewell, who has a five-year-old daughter Jodie, went into labour in October last year at 21 weeks and four days after suffering problems during her pregnancy.
She said she was told that because she had not reached 22 weeks, she was not allowed injections to try to stop the labour, or a steroid injection to help to strengthen her baby's lungs.

Instead, doctors told her to treat the labour as a miscarriage, not a birth, and to expect her baby to be born with serious deformities or even to be still-born.