If your wife is pregnant, you will have to tell the doctor about this. X-rays could effect baby badly and it is always suggested that you tell the doctors about this.
Secondly, if your wife is 4 months' pregnant, by the time you get visa or by the time you are ready to come to Canada, your baby will be born and if then you apply for visa for your baby, VO can cancel your visa on the basis of misinterpretation about not telling them about your wife being pregnant. (and no doctor suggests or allows flying in the last few months of the pregnancy).
Do not risk your baby's health for the sake of immigration. Telling the truth would be the best bet and there is not much delay if you plan well.
Also, you can apply for PP renewal within one year of expiry, so apply for that and it does not take much time to get new PPs back. In any case, you will have to renew your PPs when you are in Canada when the PPs expire until you become Canadian citizens. You cannot visit your home country with expired Passports or even cannot go to US or other countries, unless you have a valid PP.
Good Luck and congratulations for your baby.
shkhassan said:
Thanks for the info.
I think Ill proceed with the medicals including the chest X-ray to save time. As my wife passport will expire in 1st quarter of 2014 and it should have a minimum validity of 6 months to get a visa stamped. I better save that hassle. Thanks again