Common Dolphins are pregnant for around 10 to 11 months before giving birth to young which are 70 to 100 centimeters (2.3 to 3.3 ft) long, and weigh around 10 kg (22 Ib). They give birth to 1 young at a time. Females mature between the age of 2 and 7 years old and males mature between the age of 3 and 12 years old. They live for around 35-40 years.