Irish twins (also called Vatican twins) is a slang term for siblings who are not actually twins, but rather, were born less than 12 months apart - possibly in the same calendar year and/or school year. It references those Irish Catholic families who may forgo the use of birth control due to their church's teachings on it, and the perception that they may therefore have many children with little space between births. It is sometimes considered derogatory. Similarly, "Irish triplets" refers to three siblings born in two years.
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