The process of determining the preferred number and spacing of children in one's family and choosing the appropriate means to achieve this preference defines:

The answer for the question is Family planning.

Family planning allows people to attain their desired number of children and determine the spacing of pregnancies. It is achieve through use of contraceptives methods and the treatment infertility. They are different methods of contraception, including long-acting reversible contraception such as IUD, hormonal contraception such as pill among others.