The nesting instinct, also known as the maternal instinct, refers to the strong urge that pregnant women feel to create a warm, safe, and comfortable environment for their unborn baby. Synonyms for the nesting instinct include the following: maternal drive, nesting behavior, maternal urge, nurturing impulse, motherly instincts, and childbearing instincts. Women experience this instinct during pregnancy, and it usually manifests as an intense need to clean, organize, and prepare the home for the arrival of the baby. This instinct is natural and essential for ensuring that the baby is born into a healthy and nurturing environment.