There are many zinc oxide sunscreens today that market themselves as "non-nanoparticle" for this very reason. Pro tip: don't ever use spray-on sunscreen, especially around children who can't hold their breath.
It's sometimes useful for areas with a bit of hair, but not enough hair to protect the skin from the sun. However, if you do use spray sunscreen, also make sure to do it outside or other very well ventilated area.