What determines the characteristics of the development of cubs of mammals after their birth?

The number of cubs in mammals depends on the anatomical features of a particular animal species. Nature stipulates that the calves be provided with the food they need. At first, the female feeds the offspring only with milk, which has a very high nutritional value and contains all the necessary substances for the growth and development of the cubs. For example, a domestic dog that brings 3–8 puppies has 8 nipples. In a domestic pig, the average number of piglets born is 10-14. Typically, a sow has 6-7 pairs of nipples. The horse has only 2 nipples and it produces only one, very rarely 2, foal. The number of nipples in mammals is not constant and can range from 2 to 22.

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