Can 7month old babies have night terrors?

It is debated on whether babies can have bad dreams or nightmares. I believe they can if they aren't well adjusted or are stressed over something. He may be teething, having a growth spurt, or an ache somewhere...that is more likely than anything if your home is calm and your son hasn't experienced a trauma (which for a baby could be simple as falling on his bum from trying something new). I'd bring it up at his next checkup if it's still happening.