The word saukra janma means “taking birth by seminal discharge.” Animals can take their birth in this way too. However, a human being can be reformed from the saukra janma, as recommended in the Vedic civilization. Before the birth takes place, or before father and mother unite, there is a ceremony called garbhadhana-samskara, which must be adopted. This garbhadhana-samskara is especially recommended for higher castes, especially the brahmana caste. It is said in the sastras that if the garbhadhana-samskara is not practiced among the higher castes, the entire family becomes sudra. It is also stated that in this age of Kali, everyone is sudra due to the absence of the garbhadhana-samskara. This is the Vedic system.

Srila Prabhupada — SB 4.31.10, purport