Hi, I Am Priyanka, My Daughter Will Turn 3 Now.

Hi, I am Priyanka, my daughter will turn 3 now. Her weight is concern for me her birth weight was 3 kg, while now her weight is 12.1 kg which is constant from last year.
Also she have recurrent cold and cough since she was 9 months, my pediac mentioned it to be allergic cold and not of much concern which will recover by age. Can you suggest