I'm packing for a trip and realized I've been toting LO's sunscreen around in my diaper bag for weeks - and leaving my diaper bag in the car a lot. It's 100 degrees here most days though I park in the garage so it's slightly cooler.

I feel like the heat probably breaks it down? It's one of those chalky sunscreens though so the active ingredient isn't a chemical but zinc... does that make a difference? This feels stupid but LO has sensitive skin and we order her sunscreen online so I don't want to just toss it if I don't have it.