Paul Mealor, who wrote music for Prince William and Kate's royal wedding, has penned a tune called "Sleep On" as a gift to the baby, due in July. It will appear on Hayley Westenra's upcoming lullaby album Hushabye, set for release in the U.K. on June 17.
"After writing music for the royal wedding, it seemed natural to provide the musical accompaniment for the next stage of the royal couple's journey together," Mealor, 37, told the British press.
Westenra, 26, has dedicated the album to the baby and plans to send a copy to the royal couple in hopes it might help with sleepless nights.
"Paul and I got together to work on a song called 'Sleep On' in honor of William and Kate's new arrival, as it's a joyous occasion which we can all celebrate," she said.