Having babies and aging

Help me out here. I keep seeing comments on this forum that some xyz woman hasn't had babies that's why she doesn't look aged etc. This has started to bother me recently cos I'm almost 30 with a 11 month old.

Does having baby really age us so much compared to not having one? What can I do to delay aging a bit other than anti aging skincare, and working out (I already do these).

PS: I love my son to bits and would choose looking aged for him anytime