I personally have an issue

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"I personally have an issue with the cortisol studies," says Mindell. "Cortisol changes throughout the day. Even sampling cortisol is very difficult. It's based on many things, including how many hours a person has been awake, how it's sampled – it's a complicated thing. People often think 'oh, if we measure cortisol, we'll know if the baby's stressed or not stressed'."

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