I have a 19 month old grand daughter who does not speak one word of anything that is not gibberish. She often walks backwards, she often stops mid-stream and appears to stare into space for a few seconds. She clearly understands everything that is said to her. Her mother asked to point to me... ( where s grandma? ...trying to get her to speak my name). Instead my grand daughter took my phone, found a picture of me in my photo album and handed it to her mother (answering where s grandma?). I m concerned about the fact that she does not talk....she does not even say mommy or daddy. Are the walking backward and her frequent stares into space symptomatic of anything?