"The girl has an orange."
Translation:Het meisje heeft een sinaasappel.
I think it was in the notes (top right when learning): diminutives (e.g. -ken and -je) are neutral -- het.
- formatting (...a bunch, actually -- is there a FAQ on formatting here?)
slightly off-topic: in German, the diminutive -chen, which to me looks a LOT like the Dutch -ken, is also neutral and hence uses the neutral def. article das.