Good Morning B., I have no idea what M-CHAT is. I think I know what PAT is Parents as Teachers? Anyway you could be describing our 19 month old gr son Zane, so he would probably fail the test ( whatever it is lol ) also.
I can understand Shoe, Drink, Bye, Momma,Yum, Cheese when we take his picture, and yesterday he said Dogie. His brother Corbin by this age was putting 3-4 words together already.
Zane is also a thumb sucker so I have been working on stopping that, thinking if I could get his thumb out of his mouth he might start talking more instead of shaking his head yes or no. Little guy didn't like Apple Cider vinegar on his thumb or elderberry juice concentrate, would shake his hands, point, cry, jabber at me, wiping it on his shirt. Silly boy loved the hot sauce though....lol
I can't get him to sit still on my lap long enough to do flash cards, or read stories to him. I talk to him & his brother constantly, we say words not baby words, we sing songs....etc
So B. as far as advice goes, I have none :( we need it also. Will be interested to read other mama's suggestions for you.
God Bless you and yours
K. Nana of 5