Not too sure but posting my DD stats so you can compare:

6lb4oz (2.82kg)
48cm length
33cm HC.

My daughter looked (and still does) long and skinny. Your dd was longer and lighter but with a bigger head so your idea does stand up to our measurements! Will be interesting to see what others say...

eta: I see now that she was actually slightly heavier than mine but you get what i'm saying