My baby sleeps 12-14 hours over night.

Ra

My son can sleep upto 14 hours over night. Is this normal? He seems to need the sleep? I find when I've had to wake him up during the week after only 12 hours sleep then sat morn and sun morning he's wakening up sometimes 2 hours later meaning he's slept 14 solid hours. Anyone else's baby like this? The problem then he only naps once for upto 2 hours but is so grumpy and tired the hour before bed. But I cant bed him earlier than 18.45.