Imperial customs required that the emperor spend one day a month with the empress. The Empress remained childless. On 27 April 1856, another of the Xianfeng Emperor's consorts, Concubine Yi (the future Empress Dowager Cixi), gave birth to the emperor's first son, Zaichun. Some biographers mentioned that the Empress gave birth to the Xianfeng Emperor's only daughter, Princess Rong'an of the First Rank, who was actually born to Concubine Li. However, as Empress, Lady Niohuru was nominally the mother of all the Xianfeng Emperor's children, regardless of whether or not she was their birth mother. Consequently, it was the Empress who raised the Xianfeng Emperor's children and decided their punishment when they did not obey her. Concubine Yi had little to say in her son's upbringing. She once recalled, "I had... quite a lot of trouble with (the Empress) and found it very difficult to keep on good terms with her."