'Dr' Google is not a very accurate way of diagnosing ANY condition. Three circumstances rgarding speech in my own family -
Nearly fifty years ago, my twin daughters were 'non-verbal' at the age of two and a quarter. No, not autistic, just did not need to speak as they had older siblings who seemed to understand any of their demands. Started to speak at two and a half and within a fortnight went from single word to full sentence construction. Both achieved Masters Degrees when they grew up.
My eldest g.son (aged 24), IS Autistic. Always very verbal, just his social behaviour seems to have stopped around the development age of about 2or 3 years. Special secondary school for such youngsters, Achieved good GCSE's and excellent A levels (maths, chemistry, Further Maths, physics - all A's). Degree in chemical studies.
Strangely enough it was his younger brother that had speech problems, a less autistic person you could not find, but he had (what Speech and language called 'backspeech'). We could not understand anything he said, which not only caused problems at home, but at nursery and at school in Reception class. He would get so angry and frustrated that we did not know what he was saying. 'Speech and Language' did, eventually, sort this out and he is that strange object - a really lovely, bright, social teenager now.
At nineteen months, a baby is getting to realise who he is close to and strangers. It is a time when many show shyness and unwillingness to be looked after by anyone other than parents. There are still lots of standard check ups for these babies and if something needs following up then the appropriate referrals will be made.
Nobody's world needs to fall apart- just enjoy having a lovely, healthy grandson.