Why isn't "את ילד" correct?
ילד is a masculine noun and can only be applied to male.
ילדה is the feminine form
"את ילדה" female
"אתה ילד" male
So, is אתה used when you are referring to a masculine person or noun?
And את for femenine?
I can't get my computer to write in Hebrew
Google: how to add Hebrew keyboard to [insert name of your device] and you'll find some tips.