Hinamatsuri on March 3
From Wikipedia
This traditional Girls' Festival is not a national holiday. Another name for it is Momo no sekku (the Peach Festival). Girls display a set of dolls dressed in pretty costumes of courtiers of the Heian period. Many families pass these dolls from generation to generation. Other customs include displaying peach blossoms; eating red, white and green diamond-shaped mochi; and drinking shirozake, a white beverage. According to an old wives' tale, a girl who leaves her dolls on display after this holiday will be late to marry.
Shichi-Go-San on November 15
From Wikipedia
On this Shinto holiday, families celebrate a child’s accomplishment of achieving the ages of 3, 5, or 7. By custom, parents bring their children to the tutelary shrine: boys at ages 3 and 5, girls at 3 and 7. Although previously ages were reckoned by the kazoedoshi system, according to which a child was born with age one and turned two on New Year's Day, parents nowadays bring their children to shrines according to age based on birthdays. The traditional date was the fifteenth day according to the lunar calendar, that is, the full moon. November is the month when people visit the shrine to give thanks for the harvest, and parents pray in addition for their children. Children receive chitose-ame, a sweet whose name means "thousand-year (i.e. long-life) candy." It has auspicious red and white stripes, and comes in bags bearing motifs of cranes and turtles, which are also symbols of long life, as well as pines, bamboo and ume. November 15 is not a national holiday.
There is also
Kodomo no hi or Children's Day although only
boys actually celebrate this.