Britain's Prince William accompanies Prince George as he is met by Helen Haslem - the head of the lower school on arrival for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William accompanies Prince George as he is met by Helen Haslem - the head of the lower school as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William, left, accompanies Prince George as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William, left, holds Prince George's hand as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George holds Prince William's hand as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William, left, accompanies Prince George and Helen Haslem - the head of the lower school on arrival for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince George arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William, left, accompanies Prince George as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William accompanies Prince George as he is greeted by Helen Haslem - the head of the lower school as he arrives for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)
Britain's Prince William accompanies Prince George as he is met by Helen Haslem - the head of the lower school on arrival for his first day of school at Thomas's school in Battersea, London, Thursday, Sept. 7, 2017. Prince William's pregnant wife Kate was too ill with morning sickness Thursday to take young Prince George to his first day of school. (Richard Pohle/Pool Photo via AP)