From 2014. (FWIW I don't think a woman should be criminalised for drinking during pregnancy)
"The Court of Appeal heard a landmark test case this week to decide whether a mother owes compensation to her child, which was born with foetal alcohol syndrome, on the basis that the child was a victim of a crime.
The Offences Against the People Act 1861, s23 makes it a crime to maliciously administer a ‘poison or other destructive or noxious thing’ to another person so as to endanger life or cause grievous bodily harm.
It is argued by the local authority, in whose care the child now is, that the mother was so reckless in her consumption of alcohol during pregnancy that this constitutes poisoning.
At present Parliament has never enacted any laws which purposely criminalise the actions of pregnant women, although this is not the case in the US, where mothers can be sent to prison"
metro.co.uk/2014/11/06/alcohol_pregnancy-4936034/