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1.
The first baby born into a group of female friends. The use of the word "beta" implies that the arrival of this child will bring out a variety of friends' personal issues and test the strength of the bonds that hold the group together.
Friend #1: "Angie never has time to go out with us anymore. She was a lot more fun before she became a mom."

Friend #2: "Uh-oh, sounds like someone's resenting the beta baby."
by Anna LeStache April 19, 2011
 
2.
The first baby born into a group of female friends. The use of the word "beta" implies that the arrival of this child will bring out a variety of friends' personal issues and test the strength of the bonds that hold the group together.
Friend #1: "Angie never has time to go out with us anymore. She was a lot more fun before she became a mom."

Friend #2: "Uh-oh, sounds like someone's resenting the beta baby."
by Anna LeStache April 30, 2011