Purpose: The aim of the present study was to compare comparative "bloating" in the fetus with physical changes in the fetus.
Materials and Methods: The study method in this research is descriptive and analytical which has been done by referring to religious and scientific texts and the obtained information has been categorized and analyzed.
Findings: "Bloating of the soul", in addition to causing spiritual change in the fetus, also causes physical changes in it. There are two criteria for determining the time of "bloating": 1. The apparent development of the fetus before "bloating". 2. The movement of the fetus in the mother’s womb after "bloating". According to the narrations, the jurists have announced the probable time of "swelling of the soul" between 4 and 5 months. The achievements of embryology show that the fetus in this period of time has reached a relative evolution in appearance and signs of the emergence of the five senses and memory and voluntary movements have been discovered in the fetus.
Conclusion: The results showed that in the period of 4 to 5 months, which is announced in the narrations for "bloating", the fetus develops and has the necessary physical quorum for "bloating".