Credit: Chris Weeks/

Prince William and Duchess Kate are looking out for the kids.

On Sept. 29, the royal couple will open the new Oak Centre for Children and Young People at The Royal Marsden Hospital in Sutton, Surrey. The children's unit specializes in cancer diagnosis, treatment, research and education. 

William, 29, will unveil a plaque to officially open the center before he and Kate, 29, meet hospital staff, key donors and fundraisers.

William was appointed President of The Royal Marsden Hospital in May 2007. The position was previously held by his mother, the late Diana, Princess of Wales.

The newly opened Oak Centre is one of the largest comprehensive children's cancer centers in Europe. It will see almost 600 inpatients and more than 5000 day patients every year. Family-centered care is at the heart of the service for children, with parents closely involved in treatment plans both in the hospital and at home. 

Back in April, William and Kate asked their wedding guests to donate to the Royal Wedding Charitable Gift Fund in lieu of gifts. The donations all went to benefit 26 charities personally chosen by the Duke and Duchess.