"The child drinks the juice."
Translation:Barnet dricker saften.
Saft has added water and sugar (or sweeteners) to it while juice has to be made purely from fruit.
I would translate "saft" to "squash" in general.
My impression is that saft is more like what Americans call a flavoring syrup, like Grenadine. Americans don't really mix syrup and water for their kids; it's premixed like a can of Crush or Fanta.