Once your girlfriend is allowed to tell you what to do, where to go, how to dress, and how to think so replaces your birth mother as your 'new mom'. If She doesn't trick you into marriage she will eventually become your Old Mom.
Person #1: You down to get down?
Person #2: No, New Mom wants me to shop Bath and Body works with Her...
by Eric January 2, 2004
Get the New Mom mug.
After having a child:

One stares at people to see if they're watching said child.

The act of telling people to look at said child for every little thing they do.

Being annoyingly proud of said child for things that aren't really worthy of being proud of.

Saying "say hey aunt Charlee!" everytime a person walks into the room; expecting the person(s) to talk to said child every time they walk by said child.
Ex. 1- "Look at Brandy! She's slobbering!"

Ex. 2- "Say hey aunt Jenna!!" & being annoyed or sad by no response after the 800th time they have walked by.

Ex. 3- "I'm so proud of Becky! She's 8 months old and is already saying babababababa!"

Ex. 4- Maria told Jenna how annoying Nicole was being when she was trying to watch television:
"I was trying to watch t.v. and Nicole kept staring at me every time her baby moved or screamed... like she expected me to pay attention to everything the kid was doing. Definitely new mom syndrome! Ugh!"
by LeBeautifulDisaster June 20, 2013
Get the New Mom Syndrome mug.
1. a phrase to describe the enormous natural increase of the breast size of a woman who is either pregnant or nursing.

2. big breasts due to lactation.
Check out Christina Aguilaras new mom boobs!
Get the new mom boobs mug.
When someone has a new kid, pet, etc. and won't shut up about them. Bonus points when it's their first time having a kid/pet/etc. (referred to as 'pet' from now on for clarity)

They tend to highlight every little thing the pet does as amazing/cute/adorable/etc...

Asks you if you also think that it's awesome that it dod something constantly and seems to forget that they asked you the same question mere moments ago.
Also can't sit for 5 minutes without noticing something the pet did or how it's doing.

They'll point out something about the pet and how it's special and that very few other pets have this awesome and desirable trait.

If it wears off in a month, they were probably under the influence of insufferable new mom syndrome.
A: Look at Mr. Whiskers! Isn't he so adorable? (repeat x100)

B: Dude, you're being an insufferable new mom.

A: But look! Isn't he just the cutest!?
by spmtn March 12, 2022
Get the insufferable new mom mug.