verbal autistic child suddenly exchanges consonants

A verbal autistic child - 7 years old - suddenly started to exchange consonants. Often N instead of M, sometimes D instead of B, T instead of P. He says "tiss" instead of "tissue". It has been going on for a few months now. He has always needed to put something in his mouth - is there a connection? Can anything be done?
Thanks!

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Bridget is an ASHA certified, practicing speech-language pathologist. She is passionate about providing parents with information on child speech and language development as well as provide functional, easy activities to do at home! Parents have the power to make a real difference. Follow Bridget at Facebook and Pinterest for more fun!