You need to call the airlines you booked your trip with. And ask them.
Or, ALSO go to the "TSA" website and per International travel, you have to read the guidelines.
www.tsa.gov
ALSO keep in mind, that International travel, is not so easy. Meaning, you have to get Passports for yourself and your children. This takes time to process and costs money. THEN, you need to get a "Travel Consent Form" or sometimes it is called a "Parental Consent Form" for travel with minors... and this form has to be Notarized, and signed by both parents. This is to prevent child abduction and kidnapping, across nations. This is law. You need to research that. When my Husband traveled internationally with my Daughter, the Travel Agent herself, said this is "required" for travel. And, they do ask for it.
Is your children's Dad traveling with you?
Traveling, especially international travel, with newborns, will be arduous. If you can, have someone travel with you on the plane trip. That is a lot to juggle..... and it is a long flight and with probably connecting flights and/or layovers...
Ultimately, you have to find out and then attain, all the legal authorizations for travel with children, passports, and how you will carry-on and store and feed your newborns... in transit, as well.
Just some things off the top of my head. We have traveled internationally... and these are the things we had to do and consider. It takes a lot of prep... before the trip. Ahead of time.
ALSO for anything electronic and like breastpumps... keep in mind, that their electrical outlets/power supplies are most likely NOT like ours in the U.S.A... and you need to get international power adapters/converters... to operate it there. Or, you will not be able to use anything electronic there. Just another detail.
all the best,
Susan