Week Tracker

Ok I feel horrible but I have a really bad memory, and I've lost track of how many weeks old my son is. I know the month, but I need some way to keep track of the weeks and I was wondering if there's a good app or calendar for that sort of thing somewhere?
I hope I'm not the only one that's done this before!

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        it gets confuing especially going from pregnancy weeks to birth weeks! Good luck!
        About Lis Outland
        Current: Selma, North Carolina
        Birth: December 31
        On Moms.com since: Jan 11, 2014
        I'm the Mummy of a very beautiful little boy named Jayson. He and his daddy are my world. I'm an Aussie gal living in the USA.