My son is 3 years 2 months old. He is having slight cold for past 4 months. He is having no big difficulties in breathing, but having running nose and the mucus is little thick, not very watery. We consulted his pedestrian 2 times in the past 4 months. He said it is normal unless he is having any difficulties in breathing or any other problems. He gave amoxicillin and cold syrup for a week. We gave him, but cold didnt go completely. Is this normal? I don't know what to do further. Please help.