Crf

our subclass 457 visa is being processed. we are indian nationals and
my wife is 6 months pregnant.

our immigration agents ahave advised us that it is not advisable to
apply for a visa for my wife at this stage as her chest xray cannot be
performed-because of her pregnancy.on account of this ,they state that
a 457 visa will not be granted to my wife and that she can only apply
after her delivery when it is safe for her to take a chest xray.

is this a fact?are there othe roptions available?
could anyone provide some advise?
thanks
clement