If your 15-month-old child has recently been treated for two ear infections and is still congested, you can try a useful technique to help reduce coughing and mucus drainage. This involves using a syringe (without a needle) and saline or distilled water to clear the nasal passages. Adjust the amount of water based on your child's age, and gradually decrease the frequency of this technique over a few days. Most parents see an improvement in symptoms within 48 hours.