Depression hit different after the second kid was born

Had my second son 8 months ago. First kid, no problem—I was tired but happy. This time around I just feel... flat? Dead inside? Nothing's wrong, finances are fine, wife is great, kids are healthy. But I genuinely don't want to do anything. I go to work, come home, do bedtime routine, sleep. Repeat. Wife suggested I might have postpartum depression and I laughed at her because "that's for moms." But then I looked it up and... yeah, sounds like me. Appointment with a therapist next week. Honestly I'm mad it took me this long to ask for help.