over 2 years her

With the 1800s came the Industrial Revolution, a rising middle class and a new emphasis on independence. Longer working days meant more interest in unbroken sleep at night, urbanisation increased the number of new parents living away from the support of their families, and male doctors, who believed that having multiple people in the same sleep space could "poison" the air, began to replace the guidance of mothers and midwives. New books emphasised the need for rigid sleep schedules and the necessity of having infants sleep alone so that they would become independent and strong.

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