Hi Liz,
Well done on getting him to sleep through the night!! That's a great feeling, isn't it?!
It looks like his A times are on the short side and naps on the long for his age, but honestly unless you are having problems with him settling at BT or long, happy NWs, then there's no problem with it. He's likely a high sleep needs baby. When you start having those types of issues (or if he starts fighting his naps), then it will be time to look at making some routine changes. You'd just start keeping him awake by 10-15min longer and hold it for 3-5 days. If that doesn't solve it, then add another 10-15min, etc, etc.