defective pampers nappies

MY MUM PURCHASED A SIZE 4 NAPPIES FOR MY LITTLE GIRL A FEW DAYS AGO AND SEEMS LIKE EVERY SINGLE NAPPY IS DEFECTIVE AS ONCE THEY GET WET THEY FORM LIITLE CLUMPS ON THE INSIDE AND ALL THE PEE IMMEDIATELY LEAKS OUT, WETTING HER CLOTHES AND BEDDINGS.