New research indicates that while fathers in Sweden show a lower incidence of psychiatric diagnoses during their partner’s pregnancy and immediately post-birth, this trend shifts over time. A study featured in JAMA Network Open reveals a noticeable increase in diagnoses for depression and stress-related issues approximately one year following childbirth. Scientists from Sweden’s Karolinska Institutet and China’s Sichuan University spearheaded this investigation.
Jing Zhou, a PhD student at the Karolinska Institutet’s Institute of Environmental Medicine and co-lead author of the study, notes that becoming a father brings a mix of joy and new challenges. “While many fathers deeply value the close moments with their child, they might also experience strain in their relationship with their partner and a decline in sleep quality, all of which can elevate the risk of mental health problems,” Zhou explains.
Extensive Study Follows Over a Million Swedish Fathers
The study involved an analysis of data from over one million fathers in Sweden, encompassing births from 2003 to 2021. By utilizing connected national registers, the researchers tracked new psychiatric diagnoses in these men, monitoring them from a year prior to pregnancy until their child’s first birthday.
Post-First-Year Surge in Depression and Stress Diagnoses
The results indicated a decrease in psychiatric diagnoses during pregnancy and the immediate postpartum period, relative to the year preceding pregnancy. While diagnoses for anxiety and substance use stabilized back to pre-pregnancy levels by the child’s first birthday, depression and stress-related disorders demonstrated a marked rise. Specifically, these diagnoses increased by over 30 percent when compared to rates observed before pregnancy.
Donghao Lu, a senior lecturer and associate professor at the Institute of Environmental Medicine, Karolinska Institutet, and the study’s corresponding author, stated, “The delayed rise in depression was surprising and highlights the importance of recognizing signs of mental health issues in fathers well beyond their child’s birth.”
Strategic Support for Paternal Mental Well-being
The researchers acknowledge that their findings are based on clinical diagnoses, implying that men who did not seek professional help might not be represented in the data. Nevertheless, the study successfully pinpoints critical periods during early fatherhood when men are likely most susceptible to mental health challenges.
Jing Zhou concluded, “Pinpointing these periods of heightened vulnerability enables healthcare providers and other relevant parties to deliver more effective support.” Zhou added that while postpartum depression is widely discussed for mothers, the mental well-being of fathers is equally crucial for their own health and for the overall family unit.

