The NICHD Early Child Care Research Network conducted a study of child care using 1,300 infants and their families. The research included

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The study included mothers with all educational levels, which suggests a diverse sample and increases the generalizability of the findings. Including families with single mothers only or two-parent families living with extended family members would limit the sample and potentially skew the results. There is no mention of only including families with two or more children, so that option is unlikely to be the best choice.

The NICHD Early Child Care Research Network Conducted a Study