What time does baby go to bed?

My baby didn't had fixed time to sleep it varied between 12 to 3 am when she was about 6 months she used to wake up at least 3 times in between 1:30 , 5 and 7 after 6-7 months her sleeping habit has changed she sleeps by 12 and wakes up only twice around 1:30 and then 7 am in morning. she does take 1-2 naps for an hour or two throughout the day.