Why Davening for a זכר a תפילת שוא since it is סמוי מן העין ?
Most of the Oilam answered that there is a difference between
adding (to the grain) and changing (the gender of the baby).
If it is known (אינו סמוי מן העין ) I can hear this to make a difference.
Hashem refrains from being משנה הטבע when it is out in the open.
Increasing the amount might be considered less of a שינוי טבע than
a change in gender.
But by changing something that is unknown (סמוי מן העין)
there it would not make a difference between changing
the gender or increasing the amount. For the Ribono Sh.Olam.
one is not more difficult than the other.
My nephew answered (Gevaldike Chap)
A baby in the mother's womb is not a סמוי מן העין
If he can learn the whole Torah while in the womb he
also knows his own gender.
One person knowing, granted it's only a fetus in the womb,
is considered אינו סמוי מן העין and therefore a תפילת שוא