It brought a tear to James Cordon's eye

A group of mothers have released a video for World Down Syndrome Day.

50 moms climbed into their cars with their four year olds and they performed Christina Perri’s hit A Thousand Years.

The clip has now gone viral, after being shared by Carpool Karaoke creator James Cordon, who said it made him shed a tear.

The moms are members of the “Designer Genes” Facebook group, which acts as a support network for the parents of children with Down syndrome.