From Vatican News:
Pope Francis’ first homily of the year was dedicated to the figure of Mary, on the day the Church celebrates her as Mother of God. Mary was declared Mother of God at the Council of Ephesus in 431, and it was Pope Saint Paul VI who restored this solemnity to January 1st in 1974.
Women as sources of life
“On the first day of the year”, began Pope Francis, we celebrate a “nuptial union between God and humanity”, one that was inaugurated “in the womb of a woman”. “The rebirth of humanity began from a woman”, continued the Pope: “Women are sources of life”.