Mood: The mood of the video seems to be inquisitive and intriguing, with a sense of mystery. The title 'WHAT IS BABY?' suggests that the video may be exploring a concept, idea, or perhaps a term that is not widely known or understood. The overall theme appears to be informative or explanatory, possibly delving into the meaning or significance of the term 'Baby' in a particular context.

Environment: The environment or setting of the video cannot be precisely determined, but based on the images, it seems to involve various locations such as streets, buildings, and possibly workplaces, given the presence of individuals in different attire, including construction or work-related clothing. The diverse settings suggest that the video might be documentary-style, exploring different aspects or perspectives related to the theme.