I think it really depends on how organised you are. With my first, I felt like I was washing bottles all of the time so I bought extra bottles until I had a set of 10. My LB fed every 3 hours so this meant that I had enough bottles to get me through 24 hours without running out and then I’d sterilise once a day (obviously washing each bottle out after use though). With my second LB, I bought 8 bottles but this time around, I’ve got a system and am much more organised so I probably could have gotten away with only having 6.
We have 14 we’re using atm (9oz) just so we’re not constantly washing and sterilising and it gives us a bit of leeway on the busier days. But we also have about 10 of the smaller bottles (5oz I think) which we used until our youngest was wanting more than 5oz which literally happened after two months 😂, we’ve probably got around 20-25 bottles of different sizes because I’ve had my kids back to back basically so they’re all still fine and we got gifted some so we’ve just been rotating them. First was born August 2022, had my youngest May 2024 and our third is due in May 2025 so I’m just gonna rotate in the ones we haven’t been using 😅
I've had 6 bottles for both kids