"Entertainment Weekly" rated the episode "B", in its review of the fifth season. It criticized the "Arthur Fonzarelli-obsessed obstetrician," plot, though going on to praise Phoebe's "sweet interaction" with the newborn babies. Robert Bianco of "USA Today" felt the episode made use of the entire ensemble, noting "Phoebe's predictably and humorously off-center response to labor" being the highlight. Colin Jacobson of DVD Movie Guide disapproved of Ribisi's performance, adding "Ultimately, "One Hundredth" had some good moments, but it wasn't a great episode."