Tending to a little baby on trips can be a headache. Between packing food & diapers you will certainly up your luggage load too. You will have to pack those things because there in no telling if they will have what your kid is acustom to overseas. Cleaning bottles, stopping to change diapers, trying to keep the kid quiet/warm/from getting sick - You wont be able to enjoy the sites as much.
Kids dont appreciate anything until they are much older anyways. Telling your kid he or she went to Europe @ one wont be as impressive to them as them remembering they went to Europe at 6 or older.
My kid (going to be 2 in July) is a beast on roadtrips, I'm sure he would be in rare form on a plane.
