The first time I checked on my phone and told him 101 or something, but now I forget and have to keep looking it up, so I wanted to look for a countdown calendar. I couldn't find one like I was imagining so I just made a quick one:
Click HERE to download the customizable Publisher file.
I just Googled the number of days until each holiday between his birthday and added black and white clip art for those holidays (Thanksgiving, Christmas, New Year's and Valentine's Day.)
Be sure to put the pictures the day AFTER. I made the mistake at first of putting them on the last day of the countdown. Silly me!