" for 2 years out of my life?"
I think the crucial thing is 2 years, but which 2.
2 years before children, with both of you young and free enough to spend all your free time socialising, going to the beach, taking exciting trips? A hundred times yes.
But going with a toddler? Not so much.
Being really close to extended family when children are really small is invaluable IMHO.
People keep saying that before children start school, you can take them anywhere and it makes no difference to them.
Leaving aside the idea that being thousands of miles away from two sets of beloved grandparents for twice the time he's been alive won't affect him (big
to that from me), what about his primary carer?
(Given that you will be giving up work to go, I'm guessing that's you.)
You won't be living a carefree outdoor life in the sunshine, you'll be caring for a toddler, with no family support in a hot climate in an unfamiliar country where you don't know many people.
Is he planning to live in Australia as a family man with commitments to his possibly lonely and bored wife?
Or is he going to "make the most" of the experiences that will be offered through the new people he will meet at work? Will he seek to limit those experiences to ones that include you and his son, seek out other friends with small children? Or will he make his own group of friends and leave you stuck at home?
Really? You know him, what kind of guy is he?
These outdoor activities he is so keen to do in the sun - can you bring a toddler? Will he want to, or is the idea that you will spend weekends as well as weekdays alone?
You want another child in the next few years. Do you want to wait until your DS is 4 to TTC?
Or do you want to spend a significant portion of this 2 years pregnant (and possibly with a newborn).
This time in your lives - the time when your children are very tiny - is both a special one, and a demanding one.
It strikes me as a weird time to be seeking "adventure".
It's about the biggest adventure I've ever been on. And I've done a lot of travelling and lived in a lot of places.