My son doesn’t talk???

My son is 18 months in a few days (a year & a half). He’s a sweet baby. He doesn’t know any words and doesn’t use any form of communication other than crying. No pointing or anything. He just cry’s when he’s upset or hungry or wants something & I have to figure it out just like when he was smaller. Of course I already know it is because I’m his mama.

I’m just a little worried about helping him learn. He’s very stubborn, he’s only interested in what he’s interested in. He babbles and plays, just not with other baby’s. He’s a smart baby and loves to explore and climb and find new things, I just want to help him learn to communicate better.

Are there any tips or games that may help? Should I take him to a different doctor??? His doctor dismisses it every time I bring it up and says literally nothing about it.