Son making himself puke

Kr

Anyone else’s toddler shove their hand so far in their mouth they make themselves gag and eventually puke? When we notice he’s starting to do it we try to get him to stop, sometimes it works and other times it doesn’t. I’m sure it’s just a phase, figuring out how his body works and such, but it’s driving me crazy! Wondering if anyone has some tips to get him to stop!?