Thank you for your query on Healthcare Magic.
You can give Phenergan
in prescribed dose in your child.
It is a routine practice to advise Phenergan even in children below the age of 2 years.
But if it is given in prescribed dose, it wont lead to any side effects.
The main concern with the drug is sedation and drowsiness
If you are concerned about the drug or child is drowsy with this medication, you can ask your doctor for an alternative medication for cold
such as levocetrizine or chlorpheniramine
Hope I have answered your query.