Babbling refers to the vowel and syllable sounds that a baby makes in repetitions.  Babbling is the way a child discovers the sounds of the language he hears. 
 
Babbling usually starts at 6 months with simple short sounds, eg 'ga', which increase by 9 months to longer strings of sounds eg 'mamama babababa'.  Babbling is not specific to any language.  Babbling brings pleasure to babies and stimulates them.

An infant learns to produce the sounds that he hears by babbling and imitating the adults around him.  Babies don't just make random sounds.  They practice the lip, tongue, mouth and jaw movements that they hear and see others make. 

Answer all your baby's coos and babbles with your own delighted expressions.  Tell your child, 'what a nice sound you are making, I love to hear you talking'. 

Babble to your baby when you interact with him.  Position yourself near your infant, make eye contact, and repeat what he babbles.  You don't have to repeat exactly what your child babbles.  Try making short babbles 'ma ma' and long babbles 'ma ma ma ma'.  You can vary the pitch of your voice to make the turn-taking game more unpredictable and exciting.  Pause in between your talking to let your baby babble back.  This simple turn-taking will become the foundations of later conversation.

Position yourself near your infant and babble to him.