Err, I just bought my 12 week old a cup. It says 3 months plus and it is just a basic soft spout beaker from Boots. DS had a cup from 5 1/2 months (Avent magic cup) when I was preparing to return to work. It looks like DD won't be having bottles.
So, I'm defintely no expert but I'd say, give it a try but don't worry about it otherwise your LO will pick up on your stress and not cooperate :wink: . Just pick a cup, and make it fun. They'll be wanting a 'grown-up cup' soon (20 months for DS) and refusing the non-spill variety :roll: .