Potty Training..

I thought girls were easier to train.. Maybe they would be if there was only one of them, but with 2, it just seems to be an impossible task that I don't have the time for. They want to wear underwear, and sometimes I will let them. But they NEVER make it to the potty. They always just start screaming that they've peed. It's frustrating to say the least. They are 3 1/2, are definitely almost there, but not quite. I'm not going to sweat it, it'll happen someday.. I just wish it was sooner than later..