CF - There are a couple of BB mums who give formula during the day whilst bub is in care and then bf at other times. I believe this is can be done successfully. However be prepared for bub to want you a lot in the evenings and during the night. You've done a great job establising bfing so far and I am sure your DS will still love to bf.

Some one please correct me here if I am wrong. You could give bub formula in a sippy cup if you don't want to get him used to the bottle.