Hey, everyone!!! I am just wondering which size bottles do you recommend I buy for when I return to school/work? Baby will be 3 months old. I recently purchased some 4 oz bottles, but am wondering if I should've purchased the 9oz ones? My boys never took the bottle well, so they never drank over 4oz in one feeding....ever. However, my SIL and a few friends' babies all drank like 5-6 oz every 3 hours? Bottles are expensive and I just want to be sure I am not wasting my money. What do you all think? Also, when you send milk with your babies to the sitter/daycare, do you send it already prepared in separate bottles, in milk storage bags, or in one large container? Thanks so much!!!