Be sure to request a bassinet on your flight. Most good overseas carriers (unlike US based ones) have bassinets for infants which clip onto the bulkhead in front of your seat. We found good ones to be KLM, Lufthansa (w/o United codeshare) and Austrian Air. The perfect way to travel with small infants! So sane for them and you and other seatmates...Be sure to take bottles with pre-measured powdered formula to which you can add bottled water in flight, or cans of sealed prepared formula you can pop open when needed if you are not nursing. Jet lag, per se, is not an issue with an infant. Call hotels ahead to be sure they have a suitable crib waiting, or arrange to take a folding one of your own.We usually traveled with our own crib, as well as a carseat for each age/weight, an umbrella type stroller and a sturdy infant backpack for walking and sightseeing. Even with the extra luggage items, traveling with an infant is far, far easier than at any other time <smile> and for sure before they can walk or need their own seat on a long plane ride...oh yes, or become a teenager dissatisifed with nearly anything they did not plan!!
Also be sure to pack any POSSIBLY needed medical supplies and medicines for you, your husband AND your baby--not all countries are the same nor have the same formulary; know the translation for dosing of very common OTC meds, like paracetamol which is the acetaminophen (Tylenol) of most other countries. Have your physician give you an rx for anything you MAY need while gone and get it filled here to take with you. Most doctors are fine with such a procedure and recognize it is better than guesswork in another country. They also will have suggestions about what to take depending on where you are going and how long you intend to be gone. Immunizations are often suggested for other than most western EU/UK areas. After you check out all of this, you will be ready to just have fun!