Worried about 13 month old

Does anyone on here have a 13 month old? Where are they developmentally? I have a 13 month old, and 3 step kids. My stepson is 12 & autistic. During my pregnancy my mother in law would frequently tell me that when there is one, there is usually another. Because of that I have been super anxious about my son meeting his milestones. I am worried because he isn’t very verbal in the sense of saying words. He has said mama, dada, baba, weewee, hey.. but doesn’t use them all daily or even weekly. Most of the time everything is dadadada. He had met all of his milestones otherwise; walking at 9 months, he has waved(but won’t do it when prompted anymore), he uses utensils and feeds himself, he understands no, etc..

I guess I’m just looking for a little reassurance that him not talking exclusively could be normal.