Worried about my sons language development...

My son is turning 1 in a few weeks and I just don’t feel like he is where he needs to be it every time I have mentioned something to his pediatrician they say next visit.. he started babbling at 5 months but has never stayed consistent and will go a few days without making a lot of babble and only really makes screeching or random sounds but no variance babble. And when he does babble it’s almost always B sounds or M sounds and here and there D but nothing else. He’s not usually around other kids a lot so I’m not sure if that has anything to do with it. He’s engaging and he’s walking and has most all of his other milestones down but I’m just not sure when I’m suppose to really worry about this talking thing.. does it just happen one day?? I’m a first time mom so I feel completely lost on it and every time I go and look it up line it comes up with autism signs or a hearing problem and he has had his hearing checked and he passed but he is teething does that effect it at all? I’m sorry if this seems like a stupid post I’m just at a loss at the moment