What partnering and a child's arrival do to networks
Both events reduce the number of active relationships, but not in the same way nor for the same people.
The effect of partnering
Longitudinal work finds a reduction in the number of active relationships after a couple forms, a phenomenon described in the literature as dyadic withdrawal, a term proposed by the sociologist Philip Slater in 1963.
The reduction bears mainly on the least close relationships, and it comes with a growing overlap of the two networks, relationships gradually becoming common to both members of the couple. Matthijs Kalmijn described in 2003 the formation of this shared network over the stages of married life.
The effect of a child's arrival
A child's arrival is associated with a more marked reduction, both through time constraints and through a change in shared activities. Childless relationships become scarcer in the declared network.
It does, however, produce new relationships, born of childcare and school contexts, which partly replace those leaving. The network therefore changes more than it shrinks. These relationships often have a practical origin, swapping favours or coordinating the school run, and some outlive the period that gave rise to them.
Asymmetry between partners
Several surveys find a stronger reduction among mothers, consistent with the gaps measured in time use surveys on time available outside work and domestic duties.
That asymmetry narrows as children grow, without the available longitudinal surveys showing a full return to the previous level.
The gap describes a redistribution of time, not the quality of the relationships that remain. The size of a network says nothing, on its own, about how it is experienced, and the surveys cited here do not claim to measure that.
Separation
Separation produces a substantial recomposition: part of the relationships that had become common is divided between the former partners, and surveys find a net loss of relationships for at least one of them.
Work on this point is scarce and rests on small samples, which limits the reach of the published figures. Whether relationships formed before the couple and those formed during it meet the same fate is a question the available data can hardly settle.
What these results recall
Events in personal life produce effects on networks that the people concerned do not anticipate, because those effects run through contexts rather than decisions.
That is also what makes these results robust: they are found in different countries and generations, with varying magnitudes but a constant direction. They say nothing, on the other hand, about how these changes are experienced, which more qualitative methods illuminate better.
Key points
Partnering reduces the least close relationships and makes the two networks converge.
A child's arrival changes the composition of the network more than it reduces its size.
The measured reduction is stronger among mothers and does not fully return to the previous level.
This article describes documented mechanisms and disagreements. It recommends no position, no party and no vote, and commits to no reading other than that of the work it cites.
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