Welp, I'm Coming Out of Hibernation

Don't have a heart attack. Lots has happened since April and maybe
I'll get around to making a quick update on it all. Anyway, what
spurred my need to post was something Izzy said this morning.

We were laying in bed and she starts randomly singing the Happy
Birthday song to her stuffed animal (coincidentally today is Annie's
30th bday). She then turns to me and says something that I don't quite
understand, followed by, "right?" Then it dawned on me, she was
saying, "April 17, right?"

When did my 2.5 year old learn and commit to memory her own birthdate?
I mean I'm sure she has no concept of what April is, but she knows
that April and birthday are related. It absolutely blew my mind.