Found a cool percentile calculator

[WifeofAnt]

Yeah... I shouldn't worry how he's doing compared to "everybody else" but I like watching my little buddy grow!

http://www.infantchart.com/

You can enter in your LO's exact birthday (instead of just selecting age by months) and weight to see where they fall on the little graph.  I'm a little disappointed they don't have another for length though.

[Monkey Keeper]

They do!  At the top of that page, there is a hyperlink that says Length by Age.  It's in the light blue horizontal bar.

[WifeofAnt]

Oh!  I was wondering why I wasn't finding one, lol.  Thank you.

[crystal_buffaloe]

Do you know if the calculator uses the WHO charts?

ETA: I just checked, and yes it does . Thanks for sharing!

[CookAMH]

That's cool. I don't care either but am often curious. Thanks!