Newborn

A newborn is a vampire that has been recently turned.

Personality
They are often blood-thirsty, violent and uncontrollable. A newborn's emotions are hard to control and they anger easily. Bella Cullen was an exception to this rule, as she had time to think about her decision and therefore did not have the first brutal year that most vampires encounter. Or it may have been the fact that like her human mother Renee said, Bella was born 35 years old and has always had self control. Nevertheless, she amazingly controlled her thirst for human blood.

Physical Description
Another easily recognizable trait of a newborn is the eyes. All newborns' eyes start off as crimson red because of all the human blood (their own) inside their bodies. This blood also makes newborns incredibly strong. Human blood is what makes vampires so strong, so when a vampire is completely saturated with it, they are extremely strong. Bella also had crimson red eyes.

History
A vampire named Benito originally invented the idea of creating a newborn army. With a large group of vampires fighting together, they were hard to stop. This triggered the vampire wars of the south and had caused devastation within the vampire population as a result. A newborn army appeared in Eclipse when Victoria created one in Seattle, with the intent of destroying Bella Swan and the Cullens. The newborns caused carnage in Seattle, with many, many people dying at their hands. In Eclipse Jasper menchens about a Mexican vampire named Maria created an army along with Jasper. She then told him to kill all the newborns but Jasper didn't and left with Peter and Charlotte two newborns.