Blue is an aesthetic that relates to the color blue. It, like many of the colors of the rainbow, can tie into multiple aesthetics.
Blue is a color associated with the sea, sky, wisdom, calm, and cold.
Shades Of Blue
This color is a pastel blue. It has was not always associated with baby boys. In the 19th century stores like Macy's began to market pastels as children's colors. And for a time baby blue was considered a girl color, as it was softer and more feminine. But that shifted throughout the 20th century, and by the 80s it became firmly associated with boy babies.