I need somebody to settle a dispute between my wife and I. She says our three-month-old son is still a newborn, while I say he is an infant. So, at what age does a newborn become an infant.

asked 05 Feb '10, 04:27

Matthew%20Jones's gravatar image

Matthew Jones
accept rate: 18%

Goodness, if that's all you've got to argue about, things must be going great!

(08 Feb '10, 07:20) Benjol

On this site, by the author of What to Expect When You're Expecting, it says

At three months, your baby officially becomes an infant...this month marks your baby's official graduation from newborn to infant status.

This confirms what you thought and what I suspected. Good question!


answered 05 Feb '10, 11:47

DazedandConfused's gravatar image

accept rate: 13%


I've always heard that the newborn phase is the "fourth trimester", making the phase 3 months long.

(05 Feb '10, 15:48) Fun2Dream

Yes, I've heard that as well! I think the guy who wrote "The Happiest Baby On The Block" says that!

(05 Feb '10, 17:46) DazedandConfused

Wikipedia says: Newborn is the term for the first 28 days - less than a month.

I know they look so small and fragile, but newborn should only be used for really "freshly baked" children.

By the way: I love the german version of "infant": Säugling = suckling, nurseling.


answered 05 Feb '10, 06:38

brandstaetter's gravatar image

accept rate: 24%

edited 05 Feb '10, 13:18


+1 for the courage to get between a new mom and her husband. :)

(05 Feb '10, 11:15) Scott ♦♦

+1 for nurseling, I love that too! In my family it's when they smile at you for the first time. The saying tends to be "Hey look, the newborn smiled and turned into a regular baby!". So, yeah, 4 to 6 weeks is as long as "newborn" is applied here, but that's my family, so YMMV.

(06 Feb '10, 23:08) Neen
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Asked: 05 Feb '10, 04:27

Seen: 23,885 times

Last updated: 05 Feb '10, 13:18