This is really the best idea on longer flights. When making reservations ask if the airline will provide and infant travel seat. Most do, with advance notice. Airlines will alsoprovide baby food, formula, bottles and diapers on request and generally stock them on very long flights. If your child has a cold, give her a decongestant about an hour before take-off.
Hotels also provide many baby items at no additional cost.
Ask what is available for you and your baby before making reservations. When you arrive at the hotel, tape down loose electrical cords and cover any exposed outlets. Remove matches and glass objects that might break and make sure windows are closed and locked. Push the bed against the wall and line pillows on the other side to keep baby from falling out. When traveling abroad you will need a separate passport for each individual traveling, even infants.