Night time advice

My son is going on 4 weeks old and he does nothing but sleep all day long. Then around 8-9pm he wakes up and stays awake till around 1-2am and will wake every 1 1/2-2 hours. But during the day will sleep 3-4 hours at a time. And trying to keep him awake during the day seems to be impossible. Any advice to get him on a better schedule or will he eventually get it right? Everyone says at the 3 month mark? My other 2 kids started sleeping all night at 2 months old but that was so long ago I dint remember what I did lol.