I had just in case formula, I just had all the samples the freakin formula companies gave me. I had bottles too, since I would be going back to work. My MIL liked to tell me about how she had to run out and find bottles and formula for my SIL when she "couldn't" breastfeed (no wonder, with support like that). My DH hid the formula for me and was instructed not to give it to me. THere were a few times I asked, and he said no, and then when things got really bad (tongue tie caused horrible damage for a while, then we got it fixed at one month, it took another month to work itself out) and I was screaming in pain at latchon he did get the formula out. We did supplement for a while too at the advice of a ped until I got the tongue tie fixed. I am happy to say that DD is now almost six months old and only uses her bottles to drink BM out of! So,it worked for us to have the emergency stuff on hand.