My baby used to Coo a lot when she was 3months old but from past one week she has completely stopped cooing or making any other kind of sound. She is 4 months now. Is there anything to worry about?

A. Hi parent Make sure she is otherwise happy healthy and active ,and she's able to take food , sleep aptly. take sunbathing daily with her head and ears covered in the morning give her nutritioius brest milk by taking nutritioius diet