After having a long fun day with their mother, Windy Whistles, Rainbow and Scootaloo felt really tired. Windy noticed this and tucked the two sisters in. She then sang a beautiful lullaby to them and the two finally fell asleep. Best not to disturb them, folks. Shhh…
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Headcanon:

The events of Season 8-9 (With the exception of The Washouts and Best Gift Ever) and Rainbow Roadtrip are not canon.

Scootaloo gets adopted by Bow Hothoof and Windy Whistles after her original parents and two aunts pass away.

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Note: And what song was Windy singing? This song: https://youtu.be/9TgRZ2Y7iwk?si=guQyT4CAXgFIqCDG