The first thing that I noticed about the box is that all the baby clothes are sex-neutral. Here in North America it's almost impossible to find baby clothes that don't immediately scream "I'm a boy" or "I'm a girl".
Note that my experiences with this are all in the US. Now that I think about it, in cultures where there is more pressure to have kids of the "right" gender, there are other really good reasons to not tell people the gender even if you know...
Thanks for giving a definitive answer.
The box contents is neutral mainly for logistical purposes. It's cheaper to have all the boxes with same content than to carry two lines of blue and pink boxes :)