The dose of Tylenol for a child is calculated based on their weight rather than their age. It is recommended to give between 10mg/kg/dose and 15mg/kg/dose every 4 to 6 hours, with a maximum of 5 doses per day. Make sure the syrup you have contains a concentration of 160mg/5ml. You can give a dose between 3.7 and 5.5ml/dose to be within the recommended range. If a child does not like the taste of the syrup, you can consider giving a more concentrated formulation in drops to give a smaller volume while still ensuring the dose is appropriate based on weight.