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Little is known about human fathers’ physiology near infants’ births. This may represent a period during which paternal psychobiological axes are sensitive to fathers’ new experiences of interacting with their newborns and that can provide insights on how individual differences in fathers’ biology relate to post‐partum parenting. Drawing on a sample of men in South Bend, IN (U.S.), we report results from a longitudinal study of fathers’ oxytocin, cortisol, and testosterone (N = 211) responses to their first holding of their infants on the day of birth and men's reported caregiving and father‐infant bonding at 2–4 months post‐partum (N = 114). First‐time fathers’ oxytocin was higher following first holding of their newborns, compared to their pre‐holding levels. Contrasting with prior results, fathers’ percentage change in oxytocin did not differ based on skin‐to‐skin or standard holding. Drawing on psychobiological …