truthfully i wouldnt- at the moment
i would sit tight and rake in the bucks and after you know your family is finished, then i would think about starting again. at the moment you know what you job is about, no stress, no hassles and although it bores you to tears, its guaranteed $$$ and you can do you job and it works with your family
a new job is the unknown and although that is the exciting part of it, at the moment i would be hesitant to start a new career path until your baby making days are done. that way you have more chance to move up quicker as there is no stop and start with Mat leave. also your job has all your entitlements accured and with a young family there are also so handy to have up your sleeve!!

i would seriously just bide your time where you are at the moment!
your time to shine will come!!!
bucks are the goal at the moment