Yes, there are syrups for coughs that are safe for children aged 3 years old. However, it is important to note that these syrups may not always be effective in treating coughs. The main cause of coughs in children is often nasal congestion that drips down the throat. In this case, the best treatment is nasal hygiene with saline water products like Hydrasense or Sinus Rinse. It is safe and effective to use these products as needed throughout the day. It is recommended to perform nasal hygiene at least 30 minutes before bedtime. Your pharmacist can recommend the right product and show you how to use it properly.