Baby blue Definition 1 of 3Pro Tip 1/3Calm Connotation Conveys peacefulness and serenity, often used in decoration. The nursery had a soothing baby blue wallpaper. Pro Tip 2/3Gender Stereotype Traditionally associated with boys, but acceptable for any gender. Despite old customs, her baby shower theme was baby blue for her girl. Pro Tip 3/3Fashion Hue Popular color in fashion, gives a soft, understated look. He wore a baby blue tie to contrast his dark suit.