In 2:32 (אֵלֶּה פְּקוּדֵי בְנֵי-יִשְׂרָאֵל, לְבֵית אֲבֹתָם: כָּל-פְּקוּדֵי הַמַּחֲנֹת, לְצִבְאֹתָם--שֵׁשׁ-מֵאוֹת אֶלֶף וּשְׁלֹשֶׁת אֲלָפִים, וַחֲמֵשׁ מֵאוֹת וַחֲמִשִּׁים), we see that there were 603,550 Yidden. In 3:43 (וַיְהִי כָל-בְּכוֹר זָכָר בְּמִסְפַּר שֵׁמֹת, מִבֶּן-חֹדֶשׁ וָמַעְלָה--לִפְקֻדֵיהֶם: שְׁנַיִם וְעֶשְׂרִים אֶלֶף, שְׁלֹשָׁה וְשִׁבְעִים וּמָאתָיִם), we see that there were 22,273 Bechoirim. The ratio of Bechoirim to men is 1 to 30. In other words, in that group of between the ages of 20 and 60, for every Bechor, there were 30 other men. That ratio means every person had 30 siblings. Now if you would tell me that there were sometimes women that were born first, then I can say if there were another 22,000 women born first then there were another 600,000 women in Klal Yisrael. It wouldn’t change the ratio which is 1 to 30, and that is extraordinary. So every person had 30 siblings. Maybe you will say it is not shver as they gave birth 6 at a time. If we look at 3:39 (כָּל-פְּקוּדֵי הַלְוִיִּם אֲשֶׁר פָּקַד מֹשֶׁה וְאַהֲרֹן, עַל-פִּי יְרוָר--לְמִשְׁפְּחֹתָם: כָּל-זָכָר מִבֶּן-חֹדֶשׁ וָמַעְלָה, שְׁנַיִם וְעֶשְׂרִים אָלֶף), we see that there were 22,000 Leviim. As Rashi brings down, there were 300 Leviim that were Bechoirim. This poses a real problem as the ratio is 1 Levi Bechor for every 73 male siblings. Leviim did not have the Bracha of Shisha B’keres Echad so you can’t attribute it to that?
In the Ma’ayon Beis Hasho’aiva, from Rav Schwab, he says it must be that there were a great proportion of families that had daughters that were born first. So it was not the same amount of women born first as men born first. We know, Bas Techila Siman Yafa L’bonim, part of the Bracha is Bas Techila. This was a generation that had Bracha. So it must be that this generation had a disproportionate amount of daughters born first. So if there were 22,000 men Leviim, there most probably was 22,000 women Bas Leviim, however, there were many more first born Bas Leviim, and this would even out the Cheshbon.
