Just be aware that formula feeds can greatly effect your milk supply. How you feed your baby is totally your choice and in my opinion, what works best for you IS what's best. But to make an informed decision about BF/FF, just wanted to warn you that FF can reduce women's milk supply a great deal and whilst some mums manage to strike a good balance and do both for a long time, others can find that the formula takes over completely from the BF in quite a short space of time. The reasons for this can be because...
FF interfere with the sensitive supply/demand process that lets your produce milk
F milk is a different substance to breast milk and can stretch the babies tummy so babies can seem less satisfied by BF, which are also easier to digest - leading to more FF and so on.
At this point, you can rebuild your milk supply if you want to coniune breastfeeding by offering BF regularly and reducing down the amount of formula you offer. There are women who have totally stopped breastfeeding and managed to re-start it, although it is much harder further down that line.
How you feed your baby is your choice alone and its wrong for anyone to pressure you either way, but read up on BF/FF and make an informed choice whatever you do. BF can be hard but so many problems can be resolved with the right information and support. Read-up online, talk to mumsnetters - if you are considering giving up BF because of social pressures, other peoples ignorance, mis-information and lack of help/support - you don't have to. There is help and support out there. If you feel you are making an informed choice and FF is what you want to do, then carry on as you are and don't worry.
Good luck in whatever you decide .x x x