There is no cure for the common cold. These are always caused by viruses and antibiotics are quite useless. Children and babies get a lot of them as they develop their resistance to disease. Treat with rest, fluids, regular paracetamol. For children use Vicks, Karvol or Snuffle Babe to help unblock the nose. A cold will last for five to seven days and will then subside. If after five days you are feeling worse, then consult the doctor. Please note catarrhal symptoms may persist for several weeks after a cold.