After general nurse training at Christchurch Hospital from 1911 to 1914, Anne Pattrick took a four-month course at the Karitane-Harris Hospital for babies in Dunedin. It had been set up by Frederic Truby King in 1907 to train nurses for the Society for the Promotion of the Health of Women and Children (later the Royal New Zealand Plunket Society). Marked by King as having outstanding qualities, Pattrick was immediately appointed to the staff.
She served during the First World War, departing on the hospital ship Marama in 1915. While on active service she became engaged to be married to an Australian soldier, but he was to die in England in the 1918 influenza epidemic. During the war King had been invited by the British government to set up in London an infant welfare centre along Plunket lines, and he chose Pattrick to help him. Accordingly, she was released from army service in January 1918 and appointed matron of the Babies of the Empire Society’s new Mothercraft Training Centre, a position she held until 1920. This centre, subsequently named Cromwell House, grew to be an important model for infant welfare work in Britain.