This is related to babies: fertility charting. This might be informative, I guess, but what compels people to share this information?
* - It's important to make the names believable for my socio-economic situation. Upper-middle class young people give their kids names that are old fashioned or nouns ("Wingspan, Banjo - do you want to play with Remy and Cheyenne?"). Lower-middle class people get names with unusual spellings.