Awful idea, or feasible and fun?

IMO our long haul flight with a 4 month old plus shorter connecting flights were far far easier than the 3 hour flight to Spain with a 1 year old.

My advice is to hire a car the other side though and to make a holiday out of it.

Any reason why you can’t get a car? Why all the taxis or buses ( I would NOT do that by the way)? A hire car would make a lot more sense to me personally. It is a hard thing to judge before the baby is here as there is som much you don’t know. How will baby be? How will you be? I was still physically recovering at 4 months with my first baby!

My first baby went all over the place at 4 months old, perfect age to travel if you have got to grips with having a baby, as you have recovered mostly from the birth and they are not toddling or needing food.

My second was a total PITA at that age though as she was fussy about what position she slept in.

So it’s impossible to predict, but not a terrible idea.

I travelled from the Netherlands to Cornwall for a wedding when DS was four months old. It's doable but you'll need frequent stops to feed and take your baby out of the car seat/ carrier. We took two days to travel there. Expect to miss whole chunks of the wedding and dinner too as you'll take the baby out if they cry, and again, to feed and change.
However I did enjoy myself and don't regret going.
We didn't fly until DS was 7 months but had no problems. You'll need to feed on landing and takeoff as the sucking helps with pressure in the ears.

We went a similar distance for a wedding when baby was at similar age. We drove the whole way (took probably two days over it I think and saw some friends on the way) so we could take all our stuff but you get quite a good allowance on a flight so sure you will be fine. We had a great time. I travelled quite a bit during maternity leave, both with my partner and solo, and enjoyed it (obviously could be a hassle at times but overall worth it). I would say to your friend that you really want to be there, you are planning to be but that you will have to confirm nearer the time which allows you to see how you are getting on

Sounds like a terrible idea, sorry. I would be sad. Did she not think of the distance and lack of transport available for guests?

Maybe they secretly want fewer guests, so choosing a remote location helps.

Weddings tend to be very boring for kids, let alone dragging them through airports, long car/train journey afterwards. Is leaving kids at home with a relative an option?

If your little ones travel well, you could make a bit of a holiday of it? Eg book a self catering cottage nearby, hire car in Edinburgh, stay a couple of days either side of wedding, so it's not all travelling and kids can unwind after journey? Flying even short distances can be so tiring with very young children, especially if they get ear pain from air pressure. Allow for delays. I flew London-Edinburgh recently and there was a 6-hour delay at Gatwick, luckily the car hire stayed open for us to pick it up!!

What will you do about sleeping arrangements and all tje nappies and stuff you'd have to carry? Buggy, travel cot, feeding? If taxi, make sure you can book car seats.

I would have been fine with this but my baby was exceptionally easy, just her personality. I'd say it's a possibility.

Impossible to say, really. I was flying shorthaul with DS by myself from the moment he’d had his first vaccinations as all of both families are outside the UK, but only you will know closer to the time what you’ll feel comfortable with, and whether the fun of attending a close friend’s wedding is worth the hassle of a trek with a small baby. We’ve also travelled to weddings overseas with baby DS, but he was almost one, and I think nearly two.