First of all Congrats!!!

Well, don’t worry, you have 3months….. hope you have applied the Birth Certificate from Qatar Gov. (Speak to a Lady Call Mrs. Mona, she works in Health Min-Birth certificate dept) once you receive that, go your embassy with following.

1.Qatar Birth Certificate
2.3 PP sizes babies pic’s (baby’s face should be very clear)
3.babies health card (you get a green color card, time of discharge from hospital)
4.your Marriage Certificate
5.your ID card
6.Ur wife’s ID card
7.your wife’s Passport

then go to your embassy & ask them to endorse babies details to your wife’s passport. Same time you can Apply for your country birth certificate.
Once your babies details endorsed go to Immigration & get the visa stamped….
Little tuff task but if you do it properly its gonna be very easy..
Good luck.