Cephalohematoma explained — the soft head bump some newborns get after delivery

Posting as Porter Law Group, NY — medical info only.

Cephalohematoma is a pocket of blood between the skull bone and its outer covering. It's fairly common (up to 1 in 40 vaginal births, more with instrument-assisted delivery) and generally harmless — it just takes weeks to months to fully reabsorb. The main thing to monitor is jaundice, since the blood breaking down can temporarily raise bilirubin.

More detail on causes and what to expect: Newborn Cephalohematoma