Thanks for the suggestion. This feature is now live. We announced it in the Maternal & Child community:
http://www.medhelp.org/posts/show/695344
That's a great suggestion. We're actually already working on something similar but it'll be an application you can add to your baby's personal page, similar to a baby birthday ticker. It'll be based on the data that you're already entering into your baby tracker, so keep the data up-to-date and when the application is ready, all you'll have to do is add it. We'll let you know when it's available.
Thanks,
MedHelp