The birth of a human being is a great science, and therefore reformation of the act of impregnation according to the Vedic ritual called Garbhadhana-samskara is very important for generating good population. The problem is not to check the growth of the population, but to generate good population on the level of Vidura, Vyasa and Maitreya. There is no need to check the growth of population if the children are born as human beings with all precautions regarding their birth. So-called birth control is not only vicious but also useless.

Srila Prabhupada — SB 3.5.19, purport