Background The global prevalence of childhood obesity has exhibited a troubling surge in
recent years. Due to the raised questions regarding its potential correlation with infertility in …

An extensive literature theorizes the role of repartnering for cohort fertility and whether union
dissolution can be an engine for fertility. A large share of higher order unions are nonmarital …

Bateman's principles heavily influence the understanding of human reproductive behaviour.
Yet, few rigorous studies on Bateman's principles in contemporary industrialized populations …

Recent evidence suggests a positive association between fertility and cognitive ability
among Swedish men. In this study we use data on 18 birth cohorts of Swedish men to …

The role of health has never entered the debate about migrant fertility. The main goal of this
work was to explore, for the first time, the relationship between health and fertility intentions …

Partnering behavior is central to understanding fertility. Influential concepts, including
singlehood, serial monogamy, and multiple‐partner fertility, are frequently used to analyze …

Individuals increasingly enter a series of relationships during their reproductive years. As
births in higher-order unions increase, fertility becomes partially contingent on re-partnering …

Natural selection is a key mechanism of evolution, which results from the differential
reproduction of phenotypes. We describe fecundity selection at different parity transitions on …

Objective To investigate whether Swedish men living with children had elevated risk for
severe COVID-19 or infection with SARS-CoV-2 during the first three waves of the …

Background and objectives Pubertal timing is a key life history trait with long-term health
consequences in both sexes. Evolutionary theory has guided extensive research on …