Nesting behaviour refers to an instinct or urge in pregnant animals associated with an increase of estradiol (E2) to prepare a home for the upcoming newborn(s). Nest building provides protection against predators and competitors that mean to exploit or kill infants.

Why is nesting so important?

It's a natural urge that helps women feel in control of their environment, and it's also a key part of preparing for birth. It happens in nature – many animal mothers prepare a den or a nest to make sure their babies will be safe and secure. So nesting isn't just about buying baby clothes or painting the walls.

What is nesting behavior pregnancy?

Nesting during pregnancy is an instinct that finds moms-to-be preparing their homes (aka their "nests") for their baby's impending arrival. Nesting usually starts with a burst of energy late in the third trimester, but it's not a proven sign of labor.