I agree with having an emphasis on putting something thing in his mouth is a Big NoNo. Once he understands that its something that you dont want him to do he'll eventually stop. That takes time and effort however. But for now you can let close friends, family, and people who he associates with, know that he is at that phase of putting everything in his mouth, So that they too would be aware and put emphasis on No as well. With everyone saying no to him when he starts putting something in his mouth, and its not just you saying no, It might get across faster.
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