POTTY TRAINING????

HI EVERYBODY,

OK SO WHEN IS TOO EARLY TO REALLY START TRYING TO POTTY TRAIN TWINS? MY GIRLS SEEM INTERESTED & MCKENNA HATES GETTING HER DIAPER CHANGED, ALSO SHE SAYS SHE HAS TO GO POTTY BUT WHEN WE GET HER IN THERE SHE DOESNT DO ANYTHING.I HAVE POTTY TRAINED 2 CHILDREN BEFORE, 1 BOY 1 GIRL...JUST NOT AT THE SAME TIME,IT SEEMS LIKE IT WILL BE HARDER...ANY ADVICE WILL BE GREAT. THANKS,JEN