Hora'ah Treasure for Tishrei

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Instructions for children’s publications

[Regarding publications made for children:] In addition to boys and girls being separate, one from the other, it should be emphasized and stand out in the clothing that they are wearing. There [should be] a distinct difference in all of their garments. Different garments for the boy and different garments for the girl.

Also with the hat, this should be emphasized - a special hat for the boy and a special hat for the girl...

In the picture of the boy, it should stand out that his tzitzis are visible and out.

In the picture of the girl, her clothes should be suitable, in the ultimate tznius: sleeves that are as they should be, long sleeves, etc. The matter of tznius, according to most poskim, begins when a girl is three years old and a day.

(Sichos Kodesh, 5741, vol.2, p.418)

From: anashchinuch.com