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24th July 2018
09:16am BST

In case you're not aware, tummy time is where a baby lies on their belly and wriggles around for a bit.
It may seem like they're just lying there and not really doing much at all, but tummy time is in fact crucial for building head, neck and upper body strength for when the baby is older.
A baby should start doing tummy time for a few minutes every day, three times a day from soon after they're born.
https://www.instagram.com/p/BlYmPueg35o/?hl=en&taken-by=kyliejenner
Kylie shared the video of Stormi on her Snapchat for her 12 million (or whatever she has) followers.
The mum and boyfriend Travis Scott welcomed baby Stormi five months ago after successfully keeping the pregnancy a secret.
They recently revealed that they had been together for just a few weeks before Kylie became pregnant.
They met at Coachella in 2017.Explore more on these topics: