According to Acharya Sushrut, Garbha of combination of four factors coming together in the proper way, just like Ritu (season),kshetra (field), Ambu (water) and Beeja (seed) give rise to the Ankur (sprout).
The word Garbhashaya is derived by the combination of two words i.e. Garbha and Ashaya. Ashaya means the place or special site for specific Dravya (material) of the body. Thus the Garbhashaya means the special place where Garbha lies and develops . Yoni resembles the Aavarta (spirals) of the Shankha (conch shell) and having three Aavarta. The Garbhashaya lies in the third Aavarta of Yoni.
Kshetra (uterus) provides a space for development of Garbha and also protects the Garbha from external pressure or trauma. Inside the uterus, the Garbha lives the intrauterine life of 9 months.
The Shuddha Garbhashaya (normal uterus) is very essential for the safe conception and development of foetus also. Any abnormality related to uterus gives rise to infertility. If any diseases in uterus, the power of implantation is lost.
Similarly, Yoni vyapada (diseases of vagina) can cause deformity in uterus and there by interfere with conception.
The main function of Rasa dhatu is Prinana which means nourishment. According to Ayurveda, the Aahar rasa (essence of food) formed after the digestion of food consumed by mother is divided into three parts.
First part nourishes her body, second promotes the formation of milk and third nourishes the Garbha.Nabhinadi of Garbha is attached with Rasavaha nadi of mother which carries Veerya (essence) of Aahar rasa (nutritious parts) from mother to the foetus by Upasneha (indirect nutrition or diffusion) for development of foetus. The Garbha is completely dependent on the mother’s nutritional status for nourishment. If there is any improper diet taken by mother, it may directly affect the Garbha and may end up in various Garbhaj vikriti (foetal anomaly) such as Garbhasrava (abortion), Mritagarbha, Upavishtaka, Nagodara, etc.
If the Garbha does not get nourishment then it consequently gets Shosha (dried up) or miscarriage.Ayurvedic texts have very systematic description about the concept of Garbha Sambhav Samagri. In this concept, Ritu, Kshetra, Ambu and Beeja are referring to ovulatory phase, healthy uterus, proper nourishment and unvitiated semen of male and unvitiated ovum of female respectively. These are very essential for conception and ultimately the better offspring.
All the factors responsible for infertility described in modern science can be included under these four factors. Developmental anomalies of foetus are also possible due to the abnormalities in these factors. So, the concept of Garbha Sambhav Samagri is described to bring healthy offspring into the society.