I have a friend who works less now - rather than making over time he always seems to be playing video games and looking at only fans. Another friend didn’t take a promotion because it was more work, so instead he struggles with side jobs and works just as much and makes less money in the process. I have a relative who took a pay cut and his wife went ballistic when her fun money dried up.
Only you know if your energy level can hold up to the long days, but many happy healthy folks work a lot. Spending more time with the family sounds good, but spending less time, but making that time as good as possible can also be good.
Making any life changing decisions shortly after having a new baby is never a good idea - I imagine your wife would appreciate more help, but that can happen in many ways that don’t require you to be home at 5:00.