Do Not Use This Diaper Changing Counter

I have questions about this scene. First, why put a specific date on the sign? Shouldn’t they just write “do not use”, then take it down when it’s okay to use? What happens on July 17 that suddenly makes the counter all right to use, but happens without anyone being around to take the sign down? Also, what was the thought process that made the sign designer add a small child behind the parent, waving her arms for attention?