Yes, I was told the same - we’re in lansinoh 1 and have no problems switching between breast and bottle.
Actually whatever the smallest is! Might be 0 or 1, I forget!
@Katherine thank you! The size small (slow flow) says 1+ month does that sound right? X
We use the slow flow from lansinoh and my baby takes it really well ( she's 12 weeks). I'd say get the slow and try it!
I was told to always give a breastfed baby the slowest teats because it mimics the breast and you don’t run the risk of them favouring the bottle over breast x