It's probably less harsh on their skin. I've been using the kids one for my little girl but the adults one for me. I'm not sure if I notice the difference.
I actually compared the ingredients after I posted this and for some reason the kids has fragrance which the regular one doesn't! Not sure how that more suitable for kids skin. I also found one that's twice the price but says it's from 3 months up so might give that one a go 🤷‍♀️
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I imagine it's more tailored to kids, but we found the kids one caused an allergic reaction but the normal stuff has no issues