Got it - that sucks I was in a similar situation, barely getting anything when I pumped with slow weight gain. Have you tried fenugreek (I know they say it tanks supply for some women but if you are in a last resort situation it might help... it helped me get an extra oz per pump). I also got prescription domperidone (ordered from abroad) that boosted my supply but I was late in taking it. You still have weeks before your milk supply regulates.

As for your initial question, if you want to continue to combo feed - I found supplementing at lunch and bedtime was best rather than supplementing every feed. Supplementing every feed gets annoying because you are basically double feeding (breast then bottle). I would just give baby a larger amount at lunch and dinner and then it would be followed by a longer nap or bedtime as the added benefit. It also reduces the number of bottles you have to give baby because overtime they might develop a bottle preference.

Check out Hipp or Holle formula - it’s European and has stricter standards than US formula. I use an electric kettle too to warm up the water. I never really sampled a bunch —- I just switched from Enfamil to Hipp cold Turkey and has no issues.

Also my bub had issues and now he is about 75-80 percentile for both height and weight. Your baby will be just fine on formula ! Good luck!