Veteran nursing mothers will tell you, around 4 or 5 months most nursing babies begin to get very distractible. They become very aware of the world around them as they nurse, and they want to see everything that's going on. They will try to turn their heads while latched on, or equally uncomfortably, pop off and on repeatedly as big brother walks in the room, the cat meows, a car horn honks outside, etc.
A Nursing Necklace helps keep the attention of "distractible nursing baby." It typically has interesting colors, shapes and textures. You want to encourage baby to keep her attention directed toward your body. A nursing necklace will do that, by encouraging her to play with it.
And they're not just for breastfeeding mothers!
Anyone who spends any time around a baby, non-nursing mothers, grandmothers, child-care workers, etc, knows that from about 5-18 months you cannot wear jewelry! Your earrings will be torn from your head, your bracelets jerked from your wrist, and a necklace is least safe of all. If you don't want it ruined, you don't wear it. That is the beauty of these necklaces; they don't break under the strain of everyday baby wear and tear, and they are beautiful, functional and fashionable.