We evaluate men's retrospective fertility histories from the British Househ
old Panel Survey and the U.S. Panel Study of Income Dynamics (PSID). Furthe
r, we analyze the PSID men's panel-updated fertility histories for their po
ssible superiority over retrospective collection. One third to one half of
men's nonmarital births and births within previous marriages are missed in
estimates from retrospective histories. Differential survey underrepresenta
tion of previously married men compared with previously married women accou
nts for a substantial proportion of the deficits in previous-marriage ferti
lity. More recent retrospective histories and panel-updated fertility histo
ries improve reporting completeness, primarily by reducing the proportion o
f marital births from unions that are no longer intact at the survey date.