Well there are some drawbacks related to ear thermometer baby. Like it requires you to take readings from two to three times. An ear thermometer baby is quite expensive and its reading is altered if ear wax is present. An ear thermometer baby does not gives you the exact temperature in fact its readings always vary from two three points. An ear thermometer baby gives a false reading if the patient is suffering from ear infection. Thus the usage of ear thermometer baby is little bit risky especially when used for babies as parents are always conscious towards the baby's treatment and health conditions