I guess it sort of depends on what you mean. Is he completely non vocal, or does he chatter but it's not understandable?
It could be for a wide variety of reasons. Some children are slower to become vocal then others, then quickly catch up. For others it can be a developmental delay and early intervention is required. My son developed motor skills very very early...early walker, very good at things like putting blocks together, etc. I was told that because that part of his brain developed early, sometimes the other part..verbal skills, can lague a little bit.
We have our well baby check up coming up in 3 weeks, and I know at that time they do a simple evaluation of my sons milestones. He is 18 months. I would take your grandson to his pediatrician and they can do a quick assessment to help you determine whether or not this is an actual issue that requires intervention. Good luck.
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