my daughter is 16 months old, she just say mumma only. not any other words. she sings her nursery rhymes- not clear just like opera. what to do?? when she will speak. m trying to speak to her. make her to speak papa dada baa. at age of 1 she used to speak dada n baa. but now only mumma. she v well understood what I say her. n do all the chores.