I'm just interested, as I've recently had DC1 and have since discovered that giving your child a longer name but calling them by a short version seems to be a little contentious! Some people like it, but other people seem to think it is strange to register/christen your child with a name you won't actually call them.
So, DD is Alexandria but she is always known as Alex, and that has always been the plan.
Did you go for/are you planning a longer name but call your child by shorter version?
(And don't get me started on how giving your child two middle names is apparently 'overkill'!!)