carry pacifiers or something that the baby can suck on in the airplane as the airpressure affects them

carry milk powder/water (if the baby is on the bottle) on the flight – stewardess will warm it and give it to you

carry ur stroller to the gate and make sure you get it at the other gate itself and not on the hold – if u r making a stop over, make sure you get the stroller at the gate of the transit place

carry plenty of clothes and diapers in hand baggage – poop happens at the times u least expect

u can also carry a baby seat on plane – but u would need to hvae to book an adiditional seat

if no seat, then while making ur reservation, ask for a bassinet seat where u can keep the baby. for that most airlines will issue those on first come first served basis, so get to the airport early to check in

u should be fine

AM
References :
being a father of twin girls who in 2 years of their lives have already made 5 international trips