Gintama Episode 52: Make an Appointment First Before Meeting With Someone
Episode 52 of 201 of Gintama, aired April 18, 2007, 25 minutes. Available with English subtitles and dub where released.
Episode summary
It is revealed that the baby isn't Gintoki's; instead the baby was left at Yorozuya by the mother to keep her child safe from her father-in-law. Meanwhile Kagura and Shinpachi try to save the mother; Gintoki is on his way to return the baby.