Please help a clueless first timer. Can we take a fairly new newborn on domestic plane and a coach?

[champagnesupernova]

Does a newborn sit in our arms for a (short -1hr 20) flight or do we need a seat for him/her?

Similarly will he/she need to be strapped into a car seat (which we'd be taking anyway) for a coach journey?

Baby could be as young as 12 days on the day (if I go overdue but could be 4 weeks) so am conscious that I"m probably mad to even consider it.

Thanks in advance for your help

You don't need a seat for a baby under 2 years old, they will ride on your lap,I would use a sling to keep the baby close to your body. You won't need a carseat for the coach journey, I think coaches that have seat belts only have lap belts but I'm not sure.

In your arms on the plane (this is good because it means they travel for freeeee!) and they will give you a special belt to strap baby to your belt.
You'll have to ask the bus company about the car seat. I think there has been a thread along these lines on here this week, by FAQ, so maybe worth searching for that.
You're not mad to consider it IMO. Nothing is impossible. In a way, it will be the easiest time in your child's life for you to travel with them. They are easier to please at that age (boob, cuddle, sleep).

No problems.Easiest at this age.

(Hiya Moondog! Shw'mae? Wedi newid enw 'to. PSL)

(Hiya Wellis! Fedrai ddim cadw i fyny efo dy newidiadau! )

My baby was 3 weeks old wen first on a plane.

Some airlines can be funny about very newborns travelling so check each's policy - easyjet is something like 2 or 3 weeks even if not premature. They travel on your lap.

they must be 2 weeks old as a minimum I thought

We flew back from Cyprus with dd2 age 2 weeks. Easiest flight I have done. I got to cuddle her for five hours while dh got to deal with dd1 . Coach will be fine. You could strap her into her seat but you won't be able to secure the seat to the coach seat if you see what I mean. I would still put her in the seat if you can, but if not I am sure she will be fine on your lap.
Babies have to be 48 hrs old before flying. HTH.