Polish Twins 

Two children who are born during the same year yet are not twins. Sometimes they are also known as Irish Twins.

Mr. and Mrs. X had two children in less than twelve months, making those children Polish Twins.

Polish Twins by Admiral Snackbar August 8, 2004

Polish Twins 

Twins that are born within 15 months of each other.

My dad and uncle are polish twins!

Polish Twins by ryleeurl January 22, 2025