Would you listen to your doctor?

My son is having allergic reaction to his medication. They told me to take 5 mgs twice a day for a one year old. I googled it and the internet (manufacture) says a one year old should start off with 2.5 mgs and if needed 2.5 mgs twice a day, never exceed it. I’m going to question it tomorrow. I just know dr are not

Perfect when it comes to medication dosage. I once had a dr tell me to give my son a dose where he would over dosage on Tylenol suppositories— so I always question things now.