After 9 months, babies can understand a few basic words like "no" and "bye-bye." They also may begin to use a wider range of consonant sounds and tones of voice. Baby talk at 12-18 months. Most babies say a few simple words like "mama" and "dadda" by the end of 12 months -- and now know what they're saying.

When should you worry if your child is not talking?

Call your doctor if your child: by 12 months: isn't using gestures, such as pointing or waving bye-bye. by 18 months: prefers gestures over vocalizations to communicate. by 18 months: has trouble imitating sounds.

Is it normal for 2 year old not talking?

Your child may have a language delay if they don't meet the language developmental milestones for their age. Their language abilities may be developing at a slower rate than most children's. They may have trouble expressing themselves or understanding others.