The Short Version
This claim is grounded in a real finding from a large Swedish registry study showing a spike in fathers' clinical diagnoses at 12+ months postpartum. However, it overgeneralizes that single-country result into a broad rule. Multiple meta-analyses and systematic reviews place peak paternal depression at 3–6 months postpartum, not at one year or later. The Swedish study also compared the spike to pre-pregnancy baselines — not directly to the pregnancy period as the claim states — creating a key evidentiary gap.