M.M.
My grandson is now 7 months and he's been doing that since he's been 4 months. There is a teething pacifer that works wonders. I got it at Wal-Mart. Also frozen teething rings helps out. My girls didn't go thru this, I guess I was lucky. But my daughter does do those above. And it seems to work. He still hasn't gotten any of his teeth. Every child is different and developes different. Don't worry about a thing.
Mousie