Thank you. I called Delta this morning, and they were less then helpful.
The woman said shes never heard of anyone needing more then one bag of medical stuff. 
And then she began to question what specifically was medical supplies. I was saying we needed to bring Peanuts medical supplies like her feeding pump, her formula, all her meds, syringes, tapes, extensions, feeding bags, blah blah blah and shes like - "thats not medical supplies". Huh? Then what IS medical supplies. Oiy.
At first she told me we couldn't bring anyting ON the flight that we didn't need while on it. So the ONLY formula and the ONLY meds we could bring on board would be what she required for the flight. Then she said we needed to call the TSA for more specific information. She was less then helpful and very rude. I called TSA and of course, they only take calls Monday-Friday.

So i'll call Monday. But I appreciate your post and hope that we have no issues either.
I would much rather have all her formula on board, just in case anything happened to our luggage. At first the woman said all of her formula had to be checked. I asked what were to happen should the luggage get lost, because she is 100% dependant nutritionally on the formula. She basically said it would be our problem. Nice.
Hopefully we can get some clear, solid answers on Monday.