Help baby only sleeps 10 hours total

Kari

I know that baby’s at 2 months are supposed to get somewhere between 15 to 18 hours of sleep in 24 hours. My baby only sleeps about 10...he sleeps really well at night about 7 hours at a time on a good night and 5 on average. But during the day he will only cat nap for about 20 minutes at a time 40 at the most. He’s happy and healthy, eating and gaining weight. Just worried he’s not sleeping enough...