Similar to other mammals, cetacea nurse their young. However, their calves do not suck milk. If they attempted this, they would probably get a mouthful of water mixed in with their milk. Instead a mother cetacea uses a ring of muscles located around the mammary glands to squirt their milk right into the mouths of their young. Unlike humans though, the mouth of a cetacea is not connected to its lungs, thereby eliminating the possibility of water entering by accident.
Cetaceans are great divers.
Their bodies are modified to allow them to withstand great pressures far beneath the surface. Oxygen and the chemicals in the blood combine, and are released by the muscles the supply them with oxygen while they are underwater and cannot surface for air. The circulatory system pulls blood towards the brain, which redirects the oxygen to the area that needs it most, until they come up for air. Unlike humans, a quick ascent to the surface does not create dangerous gaseous bubbles, thus eliminating the danger of the bends. Cetaceans do not have a sense of smell.