When Holly was a baby, she could never resist the swing; it
always knocked her out.

Ty isn't that into the swing but it obviously worked this day...
ZZZZ...
There have been so many technology upgrades in the fifteen plus years since Holly was born, and the swing is one of them.
Ty's swing has a motor that keeps him swinging.
I remember Holly's swing had this big, old crank you turned to get it going, and it was so loud that it freaked Holly out every time... then she immediately fell back asleep.