What time does baby go to bed?

I put both my children to bed at 9pm - 930pm since they were 3 mths old. This routine helps to put a structure for them. I do not need to yell or scream at my children for their bedtime because they know what comes after their milk. They wake up at 7am / 8am. So, I personally feel that, it is always good to stick to the routine.