From a New York Times article on sunscreen and SPF: "To get the SPF advertised, you must use a full shot glass on your body."
I've also heard this elsewhere - just something to remember as the days get sunnier! Protect yourself and your little ones while you enjoy that gorgeous weather :) Re-applying often is also key. The good news is, it sounds like SPF doesn't matter that much after 30 or 50, so you can save your dollars and buy the less expensive kind!
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