1)
Why were the Bechoros only counted after the age of one month?
2)
"P'kod Kol B'chor Zachar mi'Ben Chodesh va'Ma'alah". Why did the Torah need to insert both "B'chor and Zachar"?
1.
Rashi (on the Beraisa of R. Yishmael): This teaches us K'lal sh'u Tzarich li'Ferat u'Ferat she'Hu Tzarich li'Chelal' - Had the Torah written "B'chor (K'lal) and not "Zachar" (P'rat), we would have incorporated every Peter Rechem - even females; 1 Whereas had it written "Zachar"and not "B'chor", we would have incorporated all males - even not Pitrei Rechem. 2


