Komentaryong Sumisipi para sa Job 39:2

ירחים ist nicht der gewöhnliche Ausdruck für Monat. חדש bezeichnet den Monat nach der in die äußeren Sinne fallenden, somit für jeden erkennbaren Erscheinung des verschwunden gewesenen und wieder gekommenen Lichtes, und ist daher die allgemeine Bezeichnung des Monats als Periode der Zeitrechnung. ירח aber bezeichnet den Mondlauf auch nach seinem physischen, kosmischen, tellurischen Einflusse, insbesondere auf Zeitigung und Entwicklung der Frucht, ממגד גרש ירחים (Bamidbar 33,14) תספור ירחים תמלאנה (Job 39, 2) und ist daher hier der ganz entsprechende Ausdruck. Sie konnte den Knaben nur in den ersten drei Monaten seiner Entwicklung verbergen.

והוא ימשול בך, but he will rule over you, as a master over a slave telling him what to do. In Bereshit Rabbah 20,6 we are told that the numerical value of the word הרבה, i.e. 210 is an allusion that a fetus carried by its mother for 212 days before being born, is a viable baby.” [Each of the words הרבה ארבה, apparently counts as 1 also, in addition to the letters in the word הרבה. Ed.] This is the kind of baby born after 7 months pregnancy. Concerning babies born after 9 months of pregnancy, the Talmud Niddah 38 (also the same Midrash) states that a woman gives birth (normally) after 271, 272, or 273 days of pregnancy. Concerning impure large mammals the sages say that birth occurs 12 months after fertilization.
Chiyah bar Ada, who attended the lecture of Rav and failed to comprehend what Rav explained to him. Upon trying again to explain the matter to him, Chiyah bar Abbah still did not understand it Upon being asked by Rav why he had such trouble understanding the matter, he said that his ass was in labour trying to give birth and he was nervous, fearing that the ass would die due to complications. Rav told him that an ass being overdue or giving birth a few days prematurely was nothing to worry about, seeing we do not know the precise day it is anyways beyond our power to arrange for the birth to occur on that precise date.. If she gives birth prematurely, she would not give birth in fewer days than corresponded to the respective lunar months. If she gave birth late, she would still not exceed the number of days in a solar year. Thereupon Chiyah bar Ada quoted the verse in Job 39,1 “do you know the precise season when the mountain goats give birth? Can you mind the time when the hinds calve?” [he meant that how can I be unconcerned?. Ed.] Rav answered him by quoting the very next verse in Job 39,2: “Do you know the season they give birth, when they couch to bring forth their offspring? He replied: “The one verse refers to smaller mammals, [whose period of gestation is shorter] the other verse refers to larger mammals, whose pregnancy is lengthier.