Researchers have found that within days, an infant is accustomed to his mother’s voice and prefers it over that of a stranger; within weeks, he can tell the difference between the speech sounds of his parents ’ native tongue and those of other languages; and within months, he can sense the junctures between words and thus tell the difference between normal speech and unintelligible sounds.
ويستطيع خلال اسابيع ان يفرِّق بين رنة الكلمات التي تُقال بلغة والديه واللغات الاخرى .‏ كما يتمكن في غضون اشهر ان يشعر بالفاصل بين الكلمات ،‏ فيميِّز بالتالي بين الكلام العادي والاصوات غير المفهومة .‏