Beach/ swimsuit

Taking my 16 month old to the beach in June. Is it still recommended to use a rash guard? (Long sleeve or short sleeve) in my mind I don’t want her to overheat in long sleeves, but I know the sun is very serious to babies skin. I always use SPF 100 and we have a tent from California beach Co that has a UV top.

Don’t come for me- FTM and I’ve seen under 6 month babies in a bikini at the beach. Just wondering what is best!