1. Mating: When dolphins are old enough to breed, they will choose their own pairs. When two dolphins are paired successfully, they will mate. Generally, dolphins mate in summer.

2. Pregnancy: After successful mating, male dolphins will leave directly, while female dolphins will become pregnant. When the embryo develops in the body and matures around November, the female dolphin will give birth.

3. Delivery: The female dolphin does not give birth for a long time, and can complete the delivery in about 3 hours. When the female dolphin gives birth, the tail of the young dolphin will leak out first, and finally the head will be regenerated.

Dolphins are mammals. After birth, baby dolphins depend on the milk of female dolphins to survive. When the baby dolphin eats breast milk, it will hold its breath first, then bite the nipple of the mother dolphin to suck, and will not inhale seawater during the whole process. Newborn dolphins will eat breast milk every 20 minutes. As the baby dolphins grow up, the female dolphins will stop feeding, but this time will last for one and a half to two years. Although female dolphins will stop feeding in about two years, they will still stay with young dolphins to help them resist attacks from other large creatures. The female dolphin will not leave until the young dolphin has mastered all the survival skills.