He's done it!! After a few days of constant practise (when I can distract the demanding toddler) he's got it, although he'd much rather be on his back or his tummy. My appointment with a child development specialist has come through, so I'm still going to go to check that everything is OK.
Thanks, everyone, for the reassurance.
Welly xx
Thanks, everyone, for the reassurance.
Welly xx