The earliest use of speech-like sounds has been described as cooing. During the first few months of life, the child gradually becomes capable of producing sequences of vowel-like sounds, particularly high vowels similar to [i] and [u]. By four months of age, the infant creates sounds similar to the velar consonants [k] and [g], hence the common description as ‘cooing’ or ‘gooing’ for this type of production. By the time they are five months old, babies can already hear the difference between the vowels [i] and [a] and discriminate between syllables like [ba] and [ga].
من العمر خمسة أشهر والرضع ويمكن سماع بالفعل الفرق بين أحرف العلة [i] و [أ] ويميز بين المقاطع مثل [با] و [جا].