Same! She wasn't small but a long lanky baby and we had to cut the feet out of her babygros til we got some that had long legs (M&S were fab if anyone's wondering! )Even then the clothes didn't fit the baby as he came out long and thin, needed tiny baby clothes and premie nappies.
Only thing I'd ever warn someone about bringing in is nice maternity pads, the green ones are awful, and they were rationing them last time I was in a maternity ward.
The birth plan went out the window when I was told I was having a section and the MW laughed her head off when I showed her it after (I was laughing at it too by then!) saying no birth in her experience ever went to plan!
Comfy maternity pads are a MUST. The thicker the better.