If you're looking for manga similar to Ohitori-sama Kaa-san, you might like these titles.
Yuzu, a 26-year-old mentally disabled woman with the mind of an 8-year-old, falls in love with Sosuke, a man with a similar disability. After Sosuke is involved in a fatal accident, Yuzu's family discovers she is 5 months pregnant with his child. Though Yuzu is intent on having the child, her mother, Miyoko, is immediately against it. After her family comes to terms with her pregnancy, Yuzu eventually gives birth to her daughter, Himawari. With many odds against her, Yuzu does her best to care for the daughter she so dearly loves.
A cute and touching story of a single mother, Sumireko, and her daughter, Nozomi. The manga starts off with Nozomi being sixteen years old in the first chapter, then hops back to before she was born. Finally with the third chapter starts the "real" story, when Non-Non (Nozomi) is three years old.
Three years have passed since Kentaro gave birth to his son Kotaro, and he finds himself struggling to balance his career with raising a child on his own. Papa & Kids, the cafe that he started for pregnant men and fathers, is in peril of being shuttered as business declined in the wake of waning interest in the struggles of pregnant men. Meanwhile, a male pop idol who’s gotten pregnant—and who must keep the identity of the mother secret from the prying fans and press—seeks out his help, and Kentaro’s complicated relationship with Kotaro’s mother Aki hits a few new bumps.
6th grader Shima lives with her middle-aged father, Chihiro. Shima is constantly either annoyed by what her father says, while Chihiro tries to figure out the fickle nature of a young girl. Even though there are many cases where they disagree with each other, in the end, they find each other to be tolerable.
After losing her lover, Linda's sadness drove her to reckless thoughts. I want a child. If possible, a black-haired one, just like my lover. Or else my heart is going to rip apart... Obsessed with this, Linda had her brother find an anonymous sperm donor, and she gave birth to a baby boy. Now a single mother, one and half years later, Linda meets a new potential lover: Nick, a friend of her brother, who is wonderful at housework and raising her son. But is everything that he is doing just glorifying Linda for "courageously raising her late lover's son"?