Thanks for asking this question - I was just about to post a very similar one myself!
My son is 11 weeks old today and is almost exclusively breastfed apart from a very small feed of formula last thing at night so his Daddy can feed him - it also gives me a chance to rest and for my milk supply to replenish a bit better ready for the night feeds.
I'm not too confident at expressing any more, since I have had worries over my supply that have put me off. So my question is, if I express after every feed, will that affect my supply for the next feed or will it actually trigger an increase in it? I am just about on 3-hourly feeds and at the moment I am feeding from both sides during a feed. Last night I am sure that I ran dry and he was still hungry, but I think that might have been to do with not drinking as much water as I should.
I want to start building up a stock of frozen formula, and also replace the evening bottle with expressed breastmilk.
Good luck with your new baby when he/she arrives and hope you manage to breastfeed and express well - it's hard work to begin with, but so rewarding and so worth it when you've settled into it.
Mama
xxxx