I am a citizen in united states and I am working on bring my wife and child to US on K3 and K4 visa.

Since you are U.S. citizen, you can only file as married filing jointly or married filing separately.
You should file as married filing jointly and claim your child. Attach W7 (ITIN application) with your tax return. You will get standard deduction of $10,900 and exemptions for both of you and the kid.