They have made a sequel to Boss Baby (no connections to netflix series).

Boss Baby: Family Business
Tim (kid in the first movie) is now a dad of his own with 2 daughters (one same age as he was in first one) and baby daughter. When his brother Ted (an adult version of the boss baby) comes to visit. The two fight. Turns out Tim's baby daughter is a boss baby herself and needs their help. To stop a mad man from turning babies into bad babies. She gives them a formula that turns Tim back into a kid and Ted back into boss baby for 48 hours.

The trailer shows an actual process.

https://www.youtube.com/watch?v=kRPUhENEavI

Wow, this look actually very cool. They start as adult character for some times it seem, so we get used to them, then the AR apparently happen in spurts as they drink the special baby bottle, and they regress to kids while their clothes remain unchanged. Perfect combo.

Thanbks for sharing!

And there's voice crack. That's a big plus.

Hopefully they end up using it more near the end, maybe on the villain. Obviously some back to normal AP as well, if they don't hide it off screen.

Im hoping for an interaction with Tim and his daughter

If the formula is supposed to turn adults into babies, why didn't it turn them both into babies? Don't get me wrong, I love the regression, but still.

i think the more you drink, the younger get. notice how Ted was college age and took more.