The Princess of Wales, 40, visited the maternity unit at the Royal Surrey County Hospital today, where she met staff and mothers who suffered from mental health issues after giving birth. Mother-of-three Kate, who became patron of the Maternal Mental Health Alliance in May, has previously spoken out about the strain that can be put on a new parent in the early years of a child's life. This visit marks the first solo public engagement for the Princess of Wales since she assumed her new title last month.