My baby is 26 months old but doesn't talk much and only says 1 word, is there any problem? I am very smart and understand what people say

There are many reasons that lead to children being slow to speak and stuttering, but one alarming reason today is that families lack attention and do not talk much to their children. On the other hand, many families are subjective, and only pay attention when the situation becomes serious, but it is too late. So how can we recognize children being slow to speak and stuttering?