I assume your wife is in your sponsorship.
Docs needed:
1. Original passports of you and your wife
2. ID card originals and copies
3. Birth certificate and passport of Baby
5. filled up application form
6. Blood group identification document ( if you have the hamad vaccination book, you should have it in there)
You can go to any immigration service center (I went to mesaimeer) with the above documents. You will get the ID then and there upon payment of the fees. Best of luck.