not sure if you are 2', anyway bring hot flask with warm water along, no issue with scanning at custom in malaysia, bangkok, sg, shanghai, hk. Else if get stop, pour them out and get warm water from flight attendant.

remember to bring pacifier, bolster, milk bottle, for milking your baby before taking off so they are relief from pressure on their ear.

Best if you can make them sleep before plane taking off and landing if possible and good luck.