The character Aggie from the film Nanny McPhee and the Big Bang are also featured in the movie 's prequel .
After Nanny McPhee helps to harvest the barley , with a little magic , it is revealed that old Mrs. Docherty is in fact baby Aggie from the first film about the Brown children , and that Nanny McPhee has been staying with her .
Nanny McPhee and the Big Bang