Important SSI question Will u please read?

My son recieved SSI checks from birth to 7 years old. He stopped recieving them because of my income. Cirstances have changed and I recently re applied for benefits for my son whom is severly disabled with a heart condition. With this kind of situation I was wondering if it would take the normal 90 days or so, or would it not take that long because he is already in the system (but hasn't recieved benefits in 3 years).It ponly took them 3 day to send me the report. Has anyone been through anything like this and If u have can you please share with me. My girlfriend says she thinks I will get a check on April 1st. That would be nice because we really need it. What do you think the chances are?