Carrying a baby is one of the hardest physical tasks we can ask of ourselves, she pointed out, and if our bodies decline the task, it is often a sign that they are facing too many other demands—high-stress work that keeps us in a near constant state of “fight or flight,” perhaps, or the physical stress of having to metabolize toxins or allergens, or just the stresses of modern life (or some combination of all of the above). With the body in overdrive fending off these real and perceived threats, it can start sending signals that it does not have the excess energy necessary to build and nourish
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