Oheso no himitsu
Subtitle: pika pika goro goro heso toruzo heso toruzo
By: Yagyū Genʾichirō saku.
Series: Kagaku no tomo kessakushū
Publisher: Fukuinkan Shoten
Published: 2000
Place of publication: Tōkyō
Language: jpn
Number of pages: 28
Subjects: Navel -- Juvenile literature.; Umbilical cord -- Juvenile literature.; Embryology, Human -- Juvenile literature.; Belly button.; Embryology, Human.
Genres: Juvenile literature.
Other titles: A story of the navel