My child is almost 4 months now ..she gets a warm forehead often. It's like she has a headache. she does not cry though I'm afraid to always give her
Any reading above 37.5°c is fever irrespective of what you feel with your hands.
Also note that the brain does a lot of work so their is a lot of blood flow to the head which can make it a little warm to touch.
However, that does not mean fever or sickness. As long as the temperature in your thermometer reads no
Always check body temperature with a thermometer