Your 3year old almost certainly has an allergic nasal problem called allergic rhinitis. Give him/her Allecet syrup 5ml at night and see if this helps. If it does not help he/she will need to use a nasal spray which must be prescribed by a doctor. Your child also needs to be tested for allergies. So it would be best to see a paediatrician if the Allecet does not help.
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