Pregnancy during the visa process

Dear, Members my wife got news that she is pregnant her visa application is not submitted yet. Should i tell her to write letter by her to inform the visa office or there some other procedure for it?
Does anyone think her application can be process in fast way because i am irish citizen and now she is pregnant......the baby we will have will be irish citizen.
Thankyou all..

Aww congrats on your wife been pregnant..
And please note this your wife been pregnant doesn't give the application a fast track priority...
I have few question to ask.
Are you legally married to her and do you work?
We continue from there..

Thank you for your reply
Yes i am legally married to her and i work full time.

Oh great...
Tell your wife to get doctor report on the pregnancy and you need to write a cover letter explaining to them that you wants to keep an eye on her as there is no body to help her during the pregnancy you dont want her going through it by herself that you would have gone to take care of her but you can't leave your job so you want her here with you. so you can keep an eye on her and the baby..
explain as much as you can..
Hoping that and every other documents needed will do..
Check here http://www.inis.gov.ie/en/INIS/Pages/Join%20Family..
N.B
Just an advice.. good luck