Just a short flight so feeding/latching baby during take off and landing(especially descending/landing)to release the pressure build up in the ears. Don’t need earplug. Brought LO to japan when she was 4months plus, just latch and let her sleep(night flight).
The best way to prevent baby from crying due to pressure to the ears is giving baby milk to drink during takeoff and touch down. Have a jacket to protect from cold and lots of toys to amuse baby during flight
Nothing much to prepare. Just feed the baby during take off and landing. Brought my baby to Europe when 2 months old. Baby was sleeping most of the time.