Please Help Daf Yomi Bava Metzia 42a

DAF HASHAVUA (next week)

Bava Metzia 42a

ואר"י אין הברכה מצויה אלא בדבר הסמוי מן העין-

ת"ר ההולך למוד את גורנו אומר יר"מ ה' אלוקינו שתשלח ברכה-

One who hasn't measured his grain may Daven for 

a Bracha that his grain should increase. The reason

for it is because something that is hidden from the

eye (unknown) the power of Tefillah can bring a

Bracha and change (increase) the original amount 

of grain.

The Mishna (Brachos 44a)

"If a man whose wife is pregnant (after 40 days) and

Davens that she should give birth to a זכר it is considered

a תפילת שוא"  (in vain) 

WHAT'S THE DIFFERENCE?

Why if one harvested 1,000 lbs. of wheat and he is

unaware of the amount his Tefillah can change it

to 1.200 lbs. but his Tefillah cannot change the gender

of the child even though it is hidden from his eyes 

(pre-ultrasound) 

I need help from the oilam for a good Chiluk (difference)

 Ple