I'm off to Italy and Florida during this pregnancy. I already own a bikini but not a swim costume. I vaguely remember being told that bumps have to be covered as the sunlight can penetrate through the skin to the baby. Is that true? I mean if my skin and fatty layers can't protect how will buying (a blooming expensive cos its got a maternity label) full swim costume make that much of a difference. I mean I don't suppose I gonna look particularly great in a bikini BUT I'm only going to an Italian campsite and my mum's villa - besides if I dress the kids cutely everyone looks at them instead .
I just thought that you needed to be careful not to overheat actually. I have been on holiday in Italy 3 wks ago and spent every day on the beach in a bikini, I am going back in 3 weeks for another 2 wks break and I am planning on doing the same. I think the important thing is to put a lot of cream as the skin is thinner and you run the risk of burning more easily.
Enjoy the sun, just bear in mind that tanning makes any stretch marks or future ones much worse, at the actual time of the them developing I mean, not after the event. Take care to protect your skin heavily.