i really feel sorry and do understand how you feel
because you left me message that you have the same problem
my son and husband are in canada..which makes me wanna quit my job
as many said, let your husband stay there for two months first...settle down everything
if you don mind to resign, just resign and go to Aus with your baby as a traveller and stay there with your husband
check it out if you like the environment
my case is me and my husband used to seperated...but i didn't notice there is a problem after we have kids.....even my boy come back to hk next month, he will leave me next Sep for school...even i get to transfer to work in Canada, i may have to travel back to hk to work more than half time (like your husband)....