יְשַׁלְּח֣וּ כַ֭צֹּאן עֲוִילֵיהֶ֑ם וְ֝יַלְדֵיהֶ֗ם יְרַקֵּדֽוּן׃
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Kli Yakar
And Adam lived, etc. [The Torah] made three divisions in their lifespans, as it mentioned for all of them the number of years they lived before having children, and afterward combined them together, and it mentioned for all of them “and he died.” But in the Torah portion of Noah it only mentioned two divisions and it did not mention “and he died.” This is because one who is without children is considered as dead while alive, and similarly, the wicked who do not produce good deeds are called dead while living. Therefore, it used the language of “and he lived” regarding the number of days they lived before having children because even though they were still without children, nevertheless their lives were considered “living” since all those mentioned in this genealogical chain in this portion and in Noah’s portion were all righteous — Adam, Seth, etc., all of them. After they had children, additional vitality was added to them through their children. Therefore, it mentions “and he lived” regarding the days they lived after having children. Then it combined them together to say they were all equal in goodness, for before the flood there was no deficiency found in them except for death itself, as it is written They send forth their little ones like a flock (Job 21:11) and it is written They spend their days in prosperity (Job 21:13). Furthermore, it mentioned “and he died” for all of them to indicate that they all died natural deaths on their beds and were not destroyed in the flood. However, after the flood the world changed and their days were not all equally good, therefore it did not combine them together again. And it also did not mention “and he died” because there were deficiencies in all of them besides death. Additionally, after the flood there was no need to mention “and he died” because it was obvious that they died — for who can live and not see death? It seems likely to me to say that all those mentioned in this genealogical chain were prophets, for who told Lamech that “this son will comfort us from our work and from the toil of our hands”? And so too Shem son of Noah, and likewise Enoch, Methuselah, and Eber — they serve as a prototype for all of them.
Chizkuni
כי הילדים רכים, “for the children are frail;” when speaking of the flocks, Yaakov had expressed the fear that they die if rushed;” we find reference to something like this in Job 21,11: וילדיהן ירקדון, “and their children skip about.” Yaakov’s wives and children were riding slowly on camels. (Compare 31,17.)
Rashi
There was no limit to all the peoples. They were fruitful and multiplied too much, as it is stated, “their children are [well established] in their sight,”27Iyov 21:8. a woman would conceive and bear in three days, “They send out their infants [i.e., carefree] like sheep.”28Ibid. Verse 11.