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Babies have poor coordination and motor skills, so they are better at wielding short, stubby things (like these paintbrushes in picrel)
Most paint brushes you’ll use after the age of 5 or 6 are full length.
If you are getting a soldering iron for your baby, get one with a really short tip-to-grip, bulbous handle, and bright colours.
If you’re an tween or older who read some post on tiktok about tip-to-grip distance trying to differentiate their product, you can safely ignore it.