Don't worry as situation may not be that bad. My younger child didn't speak till she was almost 3 years old. She was referred for several assessment and we were told she maybe an autistic child. One day, she suddenly did so well in her assessment and we were told she is a gifted child. She is so talkative now.
https://sg.theasianparent.com/toddler-development-15-months https://sg.theasianparent.com/late-talkers-and-speech-delay