two week old vs two weeks old

Both "two week old" and "two weeks old" are correct, but "Two week old" is used as an adjective before a noun, while "two weeks old" is used as a phrase after a noun to describe its age.

Explained by Michele A.
Editor at TextRanch

Last updated: April 03, 2025 • 4945 views

This phrase is correct when used as an adjective before a noun to describe the age of something.

"two week old"

This phrase is used to describe the age of something that is two weeks old. It functions as an adjective before a noun.

Examples:

The two week old baby slept peacefully.
I adopted a two week old kitten from the shelter.
She bought a two week old loaf of bread from the bakery.
The two week old flowers were already wilting.
The two week old car was in pristine condition.

Show examples from the web [+]

Feeding your two week old baby. By now they're probably getting the hang of feeding, but if you're struggling with breastfeeding, don't be afraid to get lots of ...
tummy time or not my two week old screams so much. help!!! Reply. Profile photo of Troy. Troy says: November 29, 2014 at 4:26 pm. try changing formula and try ...
In fact, the average one to two week old baby will likely sleep for about 16 1/2 hours a day. Of course that won't all be at one time, but hopefully you will get one ...
How far can my two-week-old see? A newborn baby's can only see blurry shapes because they are near-sighted. Perfect vision is considered to be 20/20, and a ...

Alternatives:

two weeks old
a two week old
the two week old
a two weeks old
the two weeks old

This phrase is correct when used after a noun to describe the age of something.

"two weeks old"

This phrase is used to describe the age of something that is two weeks old. It is placed after the noun it describes.

Examples:

The baby is two weeks old.
The kitten I adopted is two weeks old.
The loaf of bread she bought is two weeks old.
The flowers are already wilting, and they are two weeks old.
The car is in pristine condition, and it is two weeks old.

Show examples from the web [+]

Two weeks old – Feeding and getting out and about. Congratulations – you've survived the slightly crazy first week. Here's what to expect in the second week of ...
This too and is normal behavior for any family member. However, at two weeks old, there is no assurance that any trait or behavior the baby has will be with her ...
Review how to care for your newborn baby during her second week, including breastfeeding tips, safety advice, medical issues, common questions and answers ...
Once your baby is about two weeks old, you can begin to show him the difference between night and day (NHS 2013). In the daytime, when he's alert: Change ...

Alternatives:

two week old
a two week old
the two week old
a two weeks old
the two weeks old

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two week old vs two weeks old

"two week old"

"two weeks old"

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