B.S.
I have twin girls that are now 16 months old. As long as they're both eating and gaining weight then they should be okay. Sometimes if you switch too much between breast milk and formula it's hard on their bodies and they won't eat much. Has she tried Carnation's Good Start Formula? That worked really well with my girls and it was very easy on their little tummy's. And how often do they eat 2 oz? If it's every hour or two then that's okay. As long as her doctor doesn't see anything wrong wtih it then they should be okay. If your friend has any questions she can feel free to ask. I hope that this helps a little bit.
Bobbi