Dr Kadwa..Please suggest medicine for my 2 year kid

Sir,
My 2 year kid is a Pre-term baby, born in 7th month. Doctor says that for such kids lungs will be weak and there is very high probability of cold, cough infections. Yes, she gets very frequent cold & cough infections. Right now, she is having cough. Every day at midnight she will cough and during the cough she feels very difficult to have a gulp or even feels difficult to breathe.All day along also she will get cough every now and then. I feel that phlegm is also coming. But she is unable to throw it out and she swallows it. She is now 2 years 4 months old. She weighs 12.65 kgs and her height is 85 cms. She like milk with out sugar, eats normal rice. She does not like sweets. She sleeps generally well except when affected by cold or cough. Please suggest medicines for her cough, cold.