At 26 days of age Hannah did a completely unaided roll from her front to back. I wouldn't dare type this except we have external witnesses including my friend Nat who is a maternal and child health nurse and, like most medical professionals who encounter Hannah, was pretty gob-smacked at Hannah's strength and development.
I'd put Hannah on her tummy after a feed and change where she first impressed Nat by pushing herself up on her arms and lifting her head and turning it towards Nat. Then completely unexpectedly Hannah did a roll.
Of course it could be months before she does this again (according to Nat, rolling is a 4 month developmental milestone) but there is no doubt that Hannah is a very strong and determined little baby who has already blitzed her 1 month developmental milestones.