Any puppy biting techniques?

I just posted this yesterday but I wanted to see if there's anymore tips out there. My puppy is constantly biting. He has lots of toys and bones. I've tried yelling ouch, pushing him away, holding his mouth shut abs say no bite, and he still comes back at me biting. It's hard because I have a toddler and he bites her too. He is 7 weeks and from a shelter. I read this can happen when taken away from family too soon. Can anyone help? It's not fun for anyone when he always has to be gated in a room or else he bites.