In May 2008 in the abortion amendments to the Human Fertilisation and Embryology Bill (now Act), John Stanley voted for the abortion time limit to be lowered to 22 weeks against scientific and medical consensus which is currently 24 weeks. After four separate parliamentary votes on varying time limits, the majority of MPs voted to keep the abortion time limit at 24 weeks, in keeping with scientific and medical consensus, hence no abortion amendments were added to the bill.
In February 2015 John Stanley voted in favour of allowing mitochondrial donation, which would allow women who carried mitochondrial diseases to have genetically related children who would not inherit the disease. An October 2014 briefing report by the Human Fertilisation and Embryology Authority (HFEA), which had been investigating the issue for three years, stated that there was no evidence to show that mitochondrial donation was unsafe. However, some religious groups had said that such procedures should not be allowed. After clearing both Houses mitochondrial donation is now legal, regulated by the HFEA.