@patrick226 It may be easiest to have your mom travel to you if possible, but as an alternative, it’s easier than you may expect to fly with a newborn.
You can bring anything you need to feed the baby. They will just test liquids at security. I bring a large bottle of warm water in one of those nice insulated bottles. (ETA: and i mix it with powdered formula when baby is ready to eat). However you’ll need to eventually add more warmed water to it if you’re going 20-30 hours. Restaurants on your layovers or the flight attendants can give boiled water to add to bottled water. Mixing up the formula can be tricky if you’re holding the newborn and don’t have help, but hopefully husband would be there with you.
Also, you usually can check car seats and strollers for free, but I believe that technically depends on the airline. All major airlines that I know of offer it. These can be checked with other checked bags or at the gate.
Your baby will likely sleep most of the flight because of the motion, white noise, and contact with you. Even when taking off or landing, a pacifier or bottle will allow their ears to pop.
Good luck, and do what you need to do to get through this. It is not a requirement of new moms to suffer.
Edited to add: also, if you’re worried about baby getting ill, flu season seems to peak in November. I know baby’s immune system is more robust after 3 months they say, but it may be worth it in this case to go early to avoid that. Ask your dr though.