Visa for 1 month old infant

Dear friends,
I am a RP holder in qatar and i got visa for my wife too. Right now i am in india. I have a child (infant) one month old. Can i take him along with me to qatar, all i have is his Passport and Birth certificate. I heard that visa is not required for infants upto 3 months old. Do i need any more documents. pls advice.
Thank you
with regards.
so, with complete documents, I can just bring my baby and they will grant/ give visa here(in airport or immigration) upon arrival? how does it really work?thanks..
i also got my baby 1 old month here, no problems at all, just provide all needed documents
yes these are only documents required to entry for infant . Make sure Birth certificate issued in English.