My child is 4 years old, I am a J1 visa holder, makes him J2 visa holder. It says I can't claim child related taxes? As well as the stimulus dependant support check?

I moved to US with my family (my 4 year old son and my wife) February 2020. I am on j1 visa which makes them both my j2 dependants. My wife just got her EAD and waiting now for her SSN, but when I am now trying to fill for tax claim, I can't do it for my son as he doesnt have SSN nor he can get one without EAD card.