Medela bottles question

[Zfbaby]

Hi all,
Very sadly my boy is now formula fed due to some horrendous feeding issues which stemmed from a misdiagnosed tongue tie. We are continuing to use our medela bottles with calma to help encourage him to use his tongue and strengthen his tongue muscles and suction. My problem is that the bottles are too small (ours are mostly 5oz and lo takes 7-9oz) and the measurements printed on the bottles are coming off with the now extended use. I need to find some large bottles that have engraved ml/oz and fit the calma teats.
Can anyone help?
Thanks

 

[Calif]

Can you try fitting the calma
Nipples on another bottle? According to a review on amazon these nipples fit on all standard bottles.

 

[Zfbaby]

Unfortunately that's not the case. I now have a kitchen full of standard sized bottles that don't fit. Most use a three thread screw fit and calma use only two so they don't make a perfect seal and then either leak or make it harder for my son to use.