It’s too early to expect baby to follow sleep routine. They’re trying hard to get adjusted with the world outside mommy’s tummy. It takes time. You can try giving him sleep training. Please do read my blog on the same, hope it helps: https://babyc.in/l/dEui

Ya you are right but the babies of this age sleeps for 15-20 hrs but my baby does not sleep that much

Hi Anon, babies this small will not have any fixed schedule of sleeping, they will sleep when they want to, but will sleep for long durations. We will have to set up their sleep schedule, so that they understand the difference between day and night. I have written a post on setting up a sleep routine for the baby, if you want you can read it. I'll share the link below.
http://app.babychakra.com/feedpost/124088?ref=Akf5fc&