There is a huge decline in birthrates nationwide, so the situation is the same in suburbs. Combined with living much longer than in previous decades, plus a decrease in number of people in each household, it can only mean you see children less frequently relative to non children compared to previous decades.

https://www.childstats.gov/americaschildren/tables/pop2.asp

Add on top children staying inside more due to different entertainment options and increase in riskiness of vehicle collisions due to height of vehicles being higher and number of miles driven being much higher, and it all lends to the same phenomenon.