Garbhadhana is a composite word of Garbha (womb) and ?dh?n (process of receiving), and it literally means receiving pregnancy. It is a private rite of the intent of a couple to have a child. It is a ceremony performed before Nisheka (conception and impregnation). In some ancient texts, the word simply refers to the rite of passage where the couple have sex to have a child, and no ceremonies are mentioned.
Scholars trace Garbhadhana rite to Vedic hymns, such as those in sections 8.35.10 through 8.35.12 of the Rigveda, where repeated prayers for progeny and prosperity are solemnized,
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bestow upon us progeny and affluence-- Rig Veda 8.35.10 - 8.35.12, Translated by Ralph Griffith
The Vedic texts have many passages, where the hymn solemnizes the desire for having a child, without specifying the gender of the child. For example, the Rigveda in section 10.184 states,
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May Vishnu construct the womb, may Twashtri fabricate the member, may Prajapati sprinkle the seed, may Dhatri cherish thy embryo;
Sustain the embryo Sinivali, sustain the embryo Saraswati, may the divine Aswins, garlanded with lotuses, sustain thy embryo;
We invoke thy embryo which the Aswins have churned with the golden pieces of Arani (firewood), that thou mayest bring it forth in the tenth month.-- Rig Veda 10.184.1 - 10.184.3, Translated by HH Wilson
The desire for progeny, without mentioning gender, is in many other books of the Rigveda, such as the hymn 10.85.37. The Atharva Veda, similarly in verse 14.2.2, states a ritual invitation to the wife, by her husband to mount the bed for conception, "being happy in mind, here mount the bed; give birth to children for me, your husband". Later texts, such as the Brihadaranyaka Upanishad, in the last chapter detailing the education of a student, include lessons for his Grihastha stage of life. There, the student is taught, that as a husband, he should cook rice for the wife, and they together eat the food in certain way depending on whether they wish for the birth of a daughter or a son, as follows,
And if a man wishes that a learned daughter should be born to him, and that she should live to her full age, then after having prepared boiled rice with sesamum and butter, they should both eat, being fit to have offspring.
And if a man wishes that a learned son should be born to him, and that he should live his full age, then after having prepared boiled rice with meat and butter, they should both eat, being fit to have offspring.
The different Grhyasutras differ in their point of view, whether the garbhadhana is to be performed only once, before the first conception, or every time before the couple plan to have additional children. To answer this question, the medieval era texts of various schools discussed and offered diverse views on whether the ritual is a rite of passage for the baby's anticipation in the womb (garbha), or for the wife (kshetra). A rite of passage of the baby would imply that Garbhadhana sanskara is necessary for each baby and therefore every time the couple intend to have a new baby, while a rite of passage of the wife would imply a one time ritual suffices.
According to the Grhya Sutras, at the beginning of the performance of this sa?sk?ra, the wife dressed up and the husband recited Vedic verses consisting similes of natural creation and invocations to gods for helping his wife in conception. The rite of passage marked the milestone where both husband and wife agreed to have a child and raise a family together.