AA:I'm Avi Arditti,Rosanne Skirble is away.This week on WORDMASTER:baby talk. (MOVIE SOUND) The movie "Babies"is now showing in theaters in the United States. It's a documentary that follows four infants through their first year. Two of the families live in rural communities in Namibia and Mongolia. The other two live in busy cities --Tokyo and San Francisco, California. The director,French filmmaker Thomas Balmes,did most of the filming himself.Imagine 400 hours of footage,edited down to a 79-minute film without narration.That's "Babies. But,really,who needs a narrator when you can let babies speak for themselves?In fact,as we hear from VOA's Carol Pearson, researchers are finding that babies know more than we sometimes realize. CP:What do they know and when do they know it?Such questions have researchers monitoring babies'brains to find out. At Northwestern University,researchers recently concluded that well before babies start to speak,they recognize words and can link them to the things they represent. At four and a half months,Finn is not talking,but he definitely responds to what his mother says. The Northwestern study and others indicate that one of the best things parents can do is talk to their babiesAA: I'm Avi Arditti, Rosanne Skirble is away. This week on WORDMASTER: baby talk. (MOVIE SOUND) The movie "Babies" is now showing in theaters in the United States. It's a documentary that follows four infants through their first year. Two of the families live in rural communities in Namibia and Mongolia. The other two live in busy cities -- Tokyo and San Francisco, California. The director, French filmmaker Thomas Balmes, did most of the filming himself. Imagine 400 hours of footage, edited down to a 79-minute film without narration. That's "Babies." But, really, who needs a narrator when you can let babies speak for themselves? In fact, as we hear from VOA's Carol Pearson, researchers are finding that babies know more than we sometimes realize. CP: What do they know and when do they know it? Such questions have researchers monitoring babies' brains to find out. At Northwestern University, researchers recently concluded that well before babies start to speak, they recognize words and can link them to the things they represent. At four and a half months, Finn is not talking, but he definitely responds to what his mother says. The Northwestern study and others indicate that one of the best things parents can do is talk to their babies