Which of the following is NOT true about caput succedaneum?

Caput succedaneum is a condition characterized by the swelling of an infant's head that can occur during delivery, typically due to the pressure exerted on the head as it passes through the birth canal. This swelling is caused by the accumulation of fluid in the soft tissues of the scalp, primarily resulting from the extended pressure during delivery.

The characteristic of caput succedaneum that it resolves within 24-48 hours is true. This rapid resolution is indicative of the body's natural healing response and confirms the transient nature of the condition. The swelling is generally present at birth and is often most pronounced at the top of the head, with the ability to cross suture lines due to the nature of the soft tissue involvement.

Due to the mechanism of development, caput succedaneum does not appear 2-3 days post-birth; rather, it is usually evident immediately or shortly after delivery. Therefore, stating that it appears 2-3 days after birth does not accurately reflect the timing and clinical presentation of this condition, making the assertion false.