And he's turning.

It will still take a bit of practice until he get the most efficient way, but he's working on that:

• Digging the head into the mattress and putting the but high up (most funny)
• Rolling over the other arm, while pushing off with the other foot (very tricky)
• Overarching the back keeping the head high (works, but not a favorite)
• Or just rolling over while noone is looking (the fastest and smoothest)
  

But laying on the back or being carried up high is still a much preferred position.