Description

There is no known scene involving “baby powder” in any official Mowgli or The Jungle Book movie (including the Disney animated and live-action versions, or the Netflix film Mowgli: Legend of the Jungle). The source material also does not contain such a scene. 
Online searches for a “baby powder” scene in a movie typically refer to a gag in an adult-oriented comedy film (likely from the 1990s or 2000s) where a character, a pimp, has baby powder put on his hand before slapping someone, to leave a clear white handprint mark. This is not related to any Mowgli story. 
It is possible that the “baby powder” reference might be a misunderstanding or a description of a fan-made video, a short film, or another piece of media entirely, but it is not part of the established Mowgli cinematic canon