It is one of the most awe-inspiring sights in nature.
These amazing pictures show a dolphin giving birth to its calf, which is born tail first and, within moments, is swimming happily with its mother.
Wildlife photographer Leandro Stanzani, who has seen 11 dolphin births, was delighted to capture the moment on film.
"To take good pictures is not easy," he said.
"Most births happen during the night when light is poor. Sometimes water quality is poor, sometimes other dolphins are in the middle."
The bottlenose dolphin was born in a pool at the Oltremare Park in Rimini, Italy.
The normal gestation period for dolphins is 12 months and the birth can take anything from minutes to hours.
Young dolphins live closely with their mother for up to six years but the calf is not likely to see its father as male dolphins are not involved in the raising of offspring.
Bottlenose dolphins are known for their friendliness and curiosity towards humans.