Any tips? We have a biter!

Sooo i just feel horrible, our son is biting other kids at daycare! Has anyone else experienced this? He is our one and only baby so I’m just at a lost on what to do. We talk to him about it and not raise our voices or anything. We never bite him back (parents tell me too but We are not going to do that). He has also hits sometimes too. The hitting is more when he is upset and frustrated. He does not talk much (but it is getting better). I feel so bad for the kids and parents who he bites. Does anyone know how long this phase lasts? I think he might be starting to get his 2 year old molars, but not feeling anything popping through. Any advice or tricks is greatly appreciated!!