My baby is still not babbling. I am worried. When should they start blabbing mama or papa?

Baby will babble between 4-6 months. http://www.babycenter.com/0_baby-milestone-talking_6573.bc You're the best person to gauge your child's speech development. If she shows any of the signs listed below and you feel concerned, you may want to discuss the possibility of a language delay or hearing problem with your child's doctor. 6-12months: Your baby isn't making (or even attempting to make) any sounds or eye contact with you, doesn't make vowel sounds ("ah," "eh," "oh"), doesn't respond to her name or sounds around her at 6 months, doesn't babble at 9 months, or doesn't say single words (including "mama" or "dada") at 12 months.