The children’s writer Aino Pervik has talked about it in July, 2011 interview for kids magazine “Täheke”:
“I saw the births of Sipsik. Almost 50 years has passed since that time, when Eno Raud had sat near to me in small room and talked about his idea to write a story about little girl and her doll. The doll might be done by her brother. Then he has taken the paper and pencil and started to write. Anu was chosen as a girl name, her brother got the name Mart.
Thinking about the doll name took a little bit more time, but finally it could not get the other name, besides Sipsik.
The Sipsik means in Estonian tot or little fellow, and if someone is called Sipsik, it means he is lovely cute kid, no matter small he/she or grown-up.

The story was written and published in “Täheke” magazine.
Then Eno has written more stories about Sipsik and they were enough to put the book together.
Certainly, Sipsik has needed its own appearance. In spite of the description presented in the story, his picture was missed. Edgar Valter was the person, who created the Sipsik image.
He has drawn about twenty different variations of Sipsik and it was quite difficult to choose only one of them. They all were funny and cute, but at the end we decided together, which of them is the right image of Sipsik. This Sipsik is now in front of you: rag doll in striped suit, yarn black hair and smiley face.
It’s difficult to imagine the other Sipsik today.
Such was the first Sipsik, drawn by Edgar Valter in 1961 year.