Is it common for newborns to get thrush..??

Very

Yes they need medicine from the doctor

Yeah. My little one had its almost gone.

We have an appointment tomorrow but some family said they think he has it

Might sound weird, but if you can put your finger in his mouth and scrape it off than its NOT thrush. just formula or breast milk build up.

I'll see when he wakes up an wants to eat again

Here's a picture