Travelling with my 4.5 month old for the first time! We're flying to Europe on a 13 hour flight. What are do's and donts of flying with a 4 month old? Any tips much appreciated!

Consider buying the airbaby sky mattress. it's about $60. It is a comfortable alternative to having your baby sleep on your lap and means you can lift your baby out of the plane's bassinet without waking them. http://www.taxibaby.sg/store/p17/SkyBaby_airplane_travel_mattress.html