Most infants form attachments to both of their parents at roughly the same age. These relationships are consolidated by continued interactions, ideally in a broad array of contexts, whether or not the parents live together. The mechanisms underlying the formation and consolidation of relationships with both parents appear to be similar, although most infants establish preferential relationship with the persons who take major responsibility for their care. When parents separate, children often experience distress, and their adjustment is adversely affected when the relationship with one of their parents is severed. This can be avoided by developing parenting plans that continue to ensure that children have regular interaction with both parents in a broad array of contexts. Overnight periods provide opportunities for many important interactions.
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Lamb et al. (2001) studied this question.
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