Episode "The Dancing Boys of Afghanistan".

Bruno's younger sister is briefly seen topless in Super-8 beach footage of the Alternate Ending (DVD Extras).

10 y.o. nude boy seen washing and sitting in Banya.

Unknown episodes (in the late 80s or very early 90s): scenes including nudity (a kid sitting in a fountain).

Shower scene with a boy (deleted).

The 2nd episode: Rear nudity of a teenage boy running away from doctor with his pants down after getting an injection.

Episode "Xingu 1": nude indian girls (7-11) swimming in a lake.

This featured the occasional nudity of both boys and girls from babies through to around the age of 6, there were bath scenes and beach scenes and playing in the garden nude. Unverified.

Old archive footage shows a swimming lesson in former East Germany. Nude children (aged 6-8) of both genders shown in the shower, then in the pool.

Plenty of nude and semi-nude natives, boys and girls of different ages, throughout the series.