Your skin is a lot more sensitive then before you were pregnant, so just be smart about the time you spend in the sun, like the other girls said, sunblock and water are a must!
Just wear sunscreen... lol I don't know if all women do it, but I burnt when I was out fishing one day and I hardly ever get sunburns...
I spoke to my doctor about this and he said as long as I stay hydrated, put some sort of sunblock on and listen to my body ex. If your too hot then go to the shade, if your thirsty then drink etc. (common sense stuff lol) and that it's perfectly fine.