It’s sort of inevitable. At some point, your toddler is going to start grabbing at their diaper area while you’re changing their diaper and they’re going to end up with a fistful of bodily fluids (or solids) and it’s going to be frustrating. Sometimes you can distract them with a toy or a clean diaper. And sometimes, they’ll throw whatever you hand them and go back to grabbing.
Reddit user u/wadingin3 has a different solution that appeals to their musical nature:
Start singing hand motion songs with your kiddos as early as possible. The Wheels On The Bus and The Itsy Bitsy Spider (or Eency Weency depending on your location) work really well.
When your small human gets to that awesome stage that they shove their hands right into their diaper area during changes, sing the songs to them. Your human will do the hand motions up by their head and get distracted from the diaper change.
The Itsy Bitsy Spider and Wheels On The Bus are classic options. Here are a few more, though, if you want to switch it up from time to time.
Choose one, start singing and change as fast as you can. Good luck.