A rather belated thanks to all who offered suggestions on how to make a pull-over baby dress a bit easier to get on and off.
I used Teri's suggestion to put a continuous lap opening in the back, and it seems to have worked quite well, though I haven't put the buttons and buttonholes in yet. (How do mothers of small children get any sewing done? I did this while DH took DD out to the park.) The buttonholer on my HV Lily was playing up, so I'll probably do them by hand.
Cheers, Liz