Which of the following is NOT a symptom of craniotabes in infants?

Fever and irritability are not symptoms associated with craniotabes in infants. Craniotabes refers to the softening of the skull bones, typically noted as areas that can feel pliable or soft, especially along the suture lines, which may present as soft areas that can "pop" in and out upon palpation.

The soft areas along the suture line, as well as the bones feeling soft and flexible, are direct indicators of craniotabes. While these characteristics point towards a physical alteration in the skull, fever and irritability are more general symptoms that could indicate infection or other conditions, not specifically craniotabes. The presence of these systemic symptoms would require further evaluation and are not part of the typical presentation of craniotabes, which is primarily concerned with the structural integrity of the skull.