Heat rash

Yay summer is finally here where I live (Canada) and my daughter and I have been outside almost everyday enjoying the sun and gardening. She’s been loving it outside. I put sunscreen on her twice throughout the day (after naps i reapply) because we really don’t have a lot of shade in my backyard.
Anyways about 2 weeks ago I noticed a little rash starting on her neck, so I switched sunscreen brands. Now I use Thinkbaby which is mainly zinc based.
Now her rash is everywhere and starting around her eyes :(
We think it’s a heat rash....
she is definitely not overdressed outside. In a sleeveless top/dress and shorts or just her cloth diaper.
Are they still too young to be outside for a couple hours at a time? The weather is around 25 Celsius or 77f
I’m waiting for a dr app.
If your littles have had a heat rash, what did you do?

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