Are white tailed deer mammals and do they lay eggs or are the babies alive?

White-tailed deer are mammals. They give birth to live young rather than laying eggs. The females give birth to a single fawn or sometimes twins after a gestation period of around 6 to 7 months. The fawns are born with white spots on their coat, which helps camouflage them in the forest. These spots gradually disappear as the fawn grows older.