Thank you for your query.
There is no reason to panic. These symptoms are usually due to nasal blockage that is common to children of this age. Due to nasal blockage there is post nasal drip
over the throat which is cause of the cough
specially at night.
The baby will need a nasal congestant drop at bedtime and three times a day.A mild antiallergic drop will help too. This will help you too. Wishing your child a speedy recovery.
Have a nice day.