Help! Is this normal? Baby sleeping a lot

Hey guys,

My LO is 17 weeks and lately I feel like he's sleeping A LOT! He is down by 810, wakes up twice for a feeding and wakes up at around 8 am for another feeding. I'm thinking he wants to wake up for the day by then, but he is still visibly tired. So I feed him and he sleeps in for another 2 hours!

I keep him up for like 1.5 or 2 hours before putting him down for a nap. And his naps range from 1.5 to 2 hours. So basically his awake time in a 24 hours period is like...6.5 hours. Should I be concerned? He has plenty of dirty diapers and eats...but he doesn't eat for very long on both sides (taking bigger gulps?)

If anyone has been through this help me out! Should I take him to the dr?