yes dear,you can bring your baby without a visa upto 90 days old but with a valid passport.subjected your wife's visa is still active..after entering to qatar you have to process residense visa within one month. you need,birth certificate (attested by minstry of foreign affairs and qatar consulate in your country),sponsors(your wife) visa and id copies,bank statements (3mnths),residential contract copy,attested degree certificates(rarely asks)and of course photographs of baby. since your wife is not under your sponsorship,before proceeding check with her sponsor for additional requirements.good luck.