There was an article in the local newspaper about Amy's new kindergarten (with the headline "Now all that's missing is the children"!), with a picture of Vivien (the teacher), Stephi (the directrix), Till (the Zivi), and three children (Sana, Hussein, Kristin).
I imagine that if Amy were already going there every day, rather than once a week, she would have been on the picture, too.
It's also a little amusing that Stephi explicitly points out that "we've already got children from India, Poland, Sweden, and Arabia"; that accounts for four out of the six I know of so far :) So it's more of a coincidence that the first "batch" of children is so diverse. (And IIRC, Hussein's father is from Lebanon rather than "Arabia", though he travelled around a bit and I don't know where Hussein grew up.)