A seizure is a sudden change in the pattern of activity inside a person's brain. Seizures can lead to temporary changes in behavior and reduced ability to connect with the outside world. Seizures can come unexpectedly at any age. Newborn babies are at risk to have seizures. Known causes for a baby’s seizures include temporary lack of blood or oxygen getting to the brain during birth, infections, bleeding, and some biochemical disorders that can be diagnosed by blood or brain fluid (CSF) tests done in the hospital. In about 5-10% of babies with seizures, the seizures are the first sign of specific genetic changes that cause epilepsy. The genetic epilepsy that begins early in life includes very mild forms that disappear with age, and more severe forms that require ongoing medical care and support.