Methadone milk mother Nia Jones explains actions
A mother who was jailed for putting the heroin substitute methadone in her baby's milk, has spoken about why she did it.
Nia Jones, from Caernarfon, Gwynedd, was sentenced to three years for ill treatment in February 2010.
She was bullied in jail because of what she did and ran away.
She spoke to BBC Wales while on the run, although afterwards she turned herself in and returned to prison to complete her sentence.
Aled Hughes has been looking at the number of births in other parts of Wales to mothers using methadone.