We have re opened this thread as it is an important topic. Please keep the posts on topic and nice.
OP, FWIW, I'm a lawyer and I believe you should take this matter further.
Not only is discrimination against women for having babies a no no but you may also have a potential action under constructive dismissal, i.e, your employer seems to be putting you in a position where you are thinking of leaving, he is making your employment dificult and unpleasant so that you leave rather than terminating your contract because you took time away from work to have a baby!
All the best!