I think nine months is PLENTY of time to buy stuff so I wouldn't buy anything beforehand.

Infact, I didn't buy anything until about Week 32 and then only clothes and a cradle.

I waited until after she was born to buy a pram and she was 6 months old before I bought a cot.

You can always do your research now and make a list of the things you want - that way you're not doing nothing and you can budget ahead. If you want to feel more prepared then live on one wage and put everything else into your savings to mimic what you'll be doing when baby comes along.