At 13 days old, he doesn't yet need a routine. But to help, you could note when he sleeps and feeds now - in the next few weeks you will notice a pattern emerging. You can then plan your day around the routine the two of you are in - by a month you'll be in a routine whether you plan it or not. It will change frequently, but not hugely, just a change in feed times or naps. That's normal, just be flexible. Babies like to know what to expect and by letting them set the adgenda you are getting the most out of your time together rather than keeping a sleepy baby awake, trying to get an awake baby to nap or not feeding a hungry baby.