Mini Potty x Step Stool/Seat

First-time mom here! My son has shown some signs that he’s ready to start potty training. He’s 18 months old.

I've heard it's easier for them to learn to use the stool/seat so you don't have to retrain them for the regular toilet, plus then they can go while you're out. I found a portable, collapsible seat topper for when we go out!