Night routine for baby

My LO is 4 months and we have been having a strict night routine where we do the wind down from 6pm and LO goes to sleep by 7pm or 730pm latest. When we are out, I always tell my hubby we need to be home before 6pm for us to do the routine. Do u think I’m being selfish? I find that having a strict night routine helps my LO know that it’s night time and it’s time for him to sleep and hopefully STTN. Do you’ll have a night routine and strictly follow it?