The video of mums and their kids with Down syndrome singing in sign is all you need today.

It’s making people laugh and cry across the world and it’s all for a wonderful cause.

The video shows British mums and their children singing in cars using the form of sign language called Makaton.

The clip’s titled 50 Mums, 50 Kids, 1 Extra Chromosome because the children singing and dancing and smiling and playing in the passenger’s seat all have Down Syndrome.

The (extra) tear jerker: it’s edited to the tune of Christina Perri’s A Thousand Years.

The idea was one of the mothers’ featured in the clip, who’s a part of the Facebook group Designer Genes for the parents of children with Down Syndrome.

According to Daily Mail, she thought of the concept after watching a Singing Hands carpool karaoke video signed with Makaton.

She thought it would be “amazing” to replicate… and it is. The wide smiles and adoring interactions between the children and their mums, and sometimes other siblings, make your heart tingle.

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The video’s release is in coordination with World Down Syndrome Day on March 21, with the hashtag #wouldntchangeathing.

And the reaction to the clip, which has been viewed almost 400,000 times, has been inspiring.

Singer Christina Perri tweeted: “THIS IS THE BEST! I’m so honoured they chose my song, my heart is so full.”

And late night television host James Corden, who is known for his segment ‘Carpool Karaoke’, called it the “most beautiful Carpool Karaoke ever”, adding that it made him cry.

THIS IS THE BEST!!!!
i’m so honored they chose my song!
my heart is so full!!!#wouldntchangeathing #WDSD2018
????https://t.co/AA5bPsarU6

— christina perri (@christinaperri) March 16, 2018

50 Mums, 50 kids, 1 extra chromosome. Smile your way through this fantastic carpool karaoke film just released for World Down Syndrome Day on. 21st March. #wouldntchangeathing #WDSD18 https://t.co/yqRJoKSfFj

— Downright Special (@Downright21) March 16, 2018

A quick reminder that this is the most beautiful Carpool Karaoke ever. #wouldntchangeathing https://t.co/EMoTCEiaq3

— James Corden (@JKCorden) March 17, 2018

In Australia, more than 13,000 people are living with Down Syndrome, according to Down Syndrome Australia, and more than 270 babies are born with the condition each year.

The video is a happy way to raise awareness about a condition that affects so many. And it’s a portrayal of pure joy that’s too often absent from the conversation.

As the hashtag accompanying the world awareness day states:

Wouldn’t. Change. A. Thing.