These stamps are for "hina matsuri" or doll festival which is held every March 3rd.
About Hina Matsuri
Platforms with a red hi-mōsen are used to display a set of ornamental dolls (雛人形, hina-ningyō) representing the Emperor, Empress, attendants, and musicians in traditional court dress of the Heian period. The custom of displaying dolls began during the Heian period. Formerly, people believed the dolls possessed the power to contain bad spirits.
There is an emperor, empress, blossom and a light. The large one measures about 4.5 x 4.7 cm.