Final answer:
During birth, increased intravascular pressure can cause capillary rupture, resulting in petechiae.
Step-by-step explanation:
During the birth process, the pressure exerted increases the intravascular pressure. This can result in petechiae, which are small red or purple spots on the skin caused by capillary rupture. The increased pressure within the blood vessels can cause blood to leak out of damaged vessels, leading to the formation of petechiae.