NSW mum charged with toddler's murder

A young mother has been charged with the murder of her two-year-old daughter in Sydney's west.

The 22-year-old woman was arrested and charged on Friday over the little girl's death, which police say occurred in December, 2016.

The toddler died in hospital a day after being found unresponsive inside a car in Guildford West, according to police, who also charged a 22-year-old man in relation to the incident.

The woman is due to face the Parramatta Local Court on February 11.