Dear Tweeni
We flew to Isle of man (only 1 hr flight) when ds was 4 weeks old. Also flew to the USA (9 hr flight) when he was 10 weeks old.
I won't lie and say it was easy. Everyone said flying with young babies was easy as they slept. Well he only slept 2 hrs out of 9 on the long haul flight. However it was manageable
For the shorter flight he was a bit easier - but to be honest it is all the security stuff that is a nightmare not the flight. He always seemed to be settling down and then would need to go through the security gate - (they have to be taken out of any carrier etc.)
If you have an easy sleepy baby you may enjoy the wedding - BUT many babies cry a lot especially in the evening so by all means go to the wedding but be aware that you may possibly be dealing with a crying baby a lot of the time.
Also if you are breastfeeding you may find it takes a couple of weeks to establish this and packing/getting ready for a flight will seem very difficult if this is the case.
This doesn't mean you shouldn't plan on going - just that you need to be aware that things may not go to plan - get used it it - this is parenthood !
Do take a monitor and a baby sling - one that the baby can sleep in. At this age that is all you need and you could probably do without a pram/pushchair - though that again will depend on the baby (most like slings but some are not so keen)
One other thing is my ds was 10 days late - so if your baby arrives late and you have a difficult birth you may find it really difficult to go. Try to accept that if it all goes wrong you can give yourself the permission to stay at home. This will make things more relaxed for you.
You will need a passport -but we arranged that very quickly. The hospital photographer took the picture and we got the passprt back within a week. We did have to register the birth first though (see you need to think about loads of things)
Unless uour baby is premature they should be fine on a short flight.