Cover ur baby fully ... that is put on clothes that cover his full body. along with that keep warm wrappers ... Put on a monkey cap or anyother cap that covers his ears fully. put some cotton inside both the ears (dont put it deep)... give the baby a pacifier when the aircraft takes off and lands...see that the baby is chewing it.... or if u are feeding the baby , feed him while the aircraft takes off and lands both the time....This is mainly advised by the doctors becoz air can fill in the babys ears..... to avoid this the baby should be on the sucking reflex or else if air fills in the ears then the baby may get ear pain that is painful and may start crying.....try to keep ur baby warm in a cool climate .
Plz note: if the baby is sweating that shows that u have too many clothes on him... if the baby feels cold then u have put few clothes... so u should know ur babys needs better.... Tk care
Have a safe flight..........