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The Baby Beam is an invention made by Romeo to make people act like babies. In the Season 2 episode "Terrible Two-Some", Catboy and Owlette were zapped by the invention, and Gekko had to babysit them both. Later, it zapped Robot to make him act like a baby. Once the machine was destroyed, Owlette, Catboy, and Robot were turned back to normal.
The Baby Beam was then rebuilt in the Season 3 episode "Big Sister Motsuki" by Romeo as a mini handheld ray, but it was stolen by Motsuki, using it to turn the PJ Masks team (except PJ Robot), Luna Girl, and Romeo into babies. She later zapped the kids back to normal at the end of the episode.