I was looking to do something similar for a 90-day workout routine. I ended up writing a simple bash script, using GoogleCL, that added an event for each of the next 90 days with the week and day number of the course in the title of the event.
Something similar could easily be done to count the age of your daughter. A search for GoogleCL should bring up needed info.
I guess the drawback is that the events are not "linked" like a recurring event is if you want to make a change later.
You want an event that recurs on the 60th day of any year equivalent to Mar-1 or Feb-29 where applicable. I have done a bit of source code below. Just replace "Someone" with the name of the person you want, save as a .ics file type in notepad and upload to your calendar.
Best Answer
Ok, so in the left part of your view, click on the Other Calendars->Add->Browse Interesting Calendars->More->Week numbers