I agree with MantaRay. I did not buy anything at all, nor did I need to (including an express pump). Later down the track (ie. few months) I borrowed a pump so that I could give an EBM feed on occasion. You really don't need anything if you intend to breastfeed in my opinion and you especially don't need any formula in the house, at least initially. Good luck and don't stress about being prepared.