Buddi, calm down this happened to me as well, maybe on the last form u have missed something that they want so make sure u READ ALL QUESTIONS and write them a COVER LETTER explaining. Tell them that you have done both medical with chest X ray and send a copy of the receipt if u have any.
Even if your wife gets Visa she cant travel while being 8 months pregnant child can be born anytime soon. So that is y the might be taking a longer time in order for ur wife to give birth first and then get the visa to travel. And I think they might be helping you to get a passport for the child so that as soon as its born ur wife can get visa with the child and both can come together. Even if the baby is not born, get a passport ready.
its life but your Muslim you have to think about in a positive way, maybe there is a "khair" in this. Maybe Allah swt wants ur wife to give birth there and have her come to u with ur child safe and sound, its to risky in travelling wen ur pregnant past 7th month, some doctors always some to travel up to 7th month and after that NO ONE CAN TRAVEL.
Just make lots of Dua get the forms done asap and w.e they asked you for. and Best of Luck