Although many infants are slow to start talking, it is unusual that your niece is not making any sounds at all especially not saying 'mama' and 'dada' by now.Sometimes this situation arises in a bilingual household where the parents are speaking more than one language. If her development has been normal up until now your sister can afford to wait for a while before having her assessed. If there is any concern about her general development then she must be evaluated by a paediatrician. If she is not talking by 2 years she must be seen by a speech therapist.
The information provided does not constitute a diagnosis of your condition. You should consult a medical practitioner or other appropriate health care professional for a physical exmanication, diagnosis and formal
advice. Health24 and the expert accept no responsibility or liability for any damage or personal harm you may suffer resulting from making use of this content.