"I want a boy."
Translation:אני רוצָה ילד.
As a native Hebrew speaker, I think "אני רוצה בן" is a much more accurate translation than "אני רוצה ילד" (which can also mean a female child in case You just want children).
The thing is, in Hebrew, both "a son" and "a boy" would be translated as "בן" (a distinct word for a boy cold be "נער" but that word basically denote a male teenager.
Native speaker here - yes, it should be accepted.
Usually, when someone says אני רוצה ילד it implies that they want to have a child (as in Hebrew there is not a word that indicates a child without referring to its gender). So for me, if I wanted to specify that I want to have a baby boy, saying אני רוצה בן is actually BETTER than אני רוצה ילד.
If I would only wanted to say that I want to have a child, but it's not important for me whether a boy or a girl, then אני רוצה ילד is probably better.
Edit: so just to be clear, אני רוצה בן was my answer too, and I reported it (on March 29th 2017) when it was marked wrong