I love kiddie logic... Today's conversation went like this:
Anna: Mummy, why are there fewer days in February than in any other month?
Me: Well February used to be the last month of the year so it is shorter than the others and that's why they sometimes add an extra day, they used to add it on to the end of the year...
Anna: (walking away) Oh I see... January, March, April, May, June, July, August, September, October, November, December, February. January, March... right!