When new parents become unhappy, brothers and sisters become less likely

Couples who perceive a drop in happiness in the first year after they became parents, have a lower probability of having a second child. A study by the Max Planck Institute for Demographic Research (MPIDR) in Rostock, Germany, has shown that the larger the loss in well-being, the smaller the probability of a second baby. The effect is especially strong for mothers and fathers who are well educated and older.

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