No evidence for relationship between paternal post-partum depressive symptoms and testosterone or cortisol in first-time fathers.

Male life history strategies are regulated by the neuroendocrine system. Testosterone (T) and cortisol regulate male behaviors including parenting and facilitate managing tradeoffs at key transitions in development such as first-time fatherhood. Both hormones demonstrate marked fluctuations in the postnatal period, and this presents an opportunity to investigate the role of T and cortisol in postpartum depressive symptoms-comparably less studied in fathers than in mothers in the evolutionary literature.

Earlier sexual debut predicts higher (not lower) levels of father care measured across 12 weeks: an experience sampling study.

Across the lifespan, males negotiate the tradeoff between current and future reproduction. From a life history theory (LHT) perspective, resources invested into earlier reproduction pose a cost to later reproduction. The age of sexual debut is a commonplace measure of sexual maturation.

The postnatal testosterone rebound in first-time fathers and the quality and quantity of paternal care.

In human males, testosterone (T) decreases in the period following the birth of offspring. This decline has been widely interpreted as a facultative neuroendocrine response that facilitates parenting effort. Conversely, research on if (or when) this decline in T would be followed by an eventual recovery and subsequent shift away from parenting effort is lacking.

The role of maternal environment on calibrating "Mini Puberty" in early infant development.

The postnatal period is a time of increased brain development and plasticity which have enduring influences on brain and behavior. Infants demonstrate a transient surge in testosterone (T) during development referred to as "mini puberty". The utility of studying mini puberty in psychobiology has only recently emerged.

Life History Orientation Predicts COVID-19 Precautions and Projected Behaviors.

The ongoing Coronavirus disease (COVID-19) pandemic has had a devastating impact worldwide. It is unclear as to what one expects during the "post-peak" and "post-pandemic" periods in terms of: (1) continued adherence to precautionary measures (e.g.

Life history and individual differences in male testosterone: Mixed evidence for early environmental calibration of testosterone response to first-time fatherhood.

Male testosterone (T) decreases in response to childbirth. Longitudinal support for this has come from samples across cultures. In this study, we look at individual differences in this phenomenon.

Outcomes of parental investment in high-risk children.

This study assesses the combined effects of children's early medical risk (e.g., preterm status) and parental investment levels (time spent in provision of care to target children as opposed to other family members) on children's response to novel, potentially distressing stimuli.

Preventing children's aggression: outcomes of an early intervention.

Mothers of medically at-risk infants were randomly assigned to a Healthy Start intervention (HV) or a cognitive reframing intervention (HV+). Outcome measures were taken at the conclusion of the intervention (1 year) and at the 3-year follow-up visit. At age 3, children in the HV+ condition (in comparison with those in the HV condition) showed fewer aggression problems (as measured by the Child Behavior Checklist).