UAB

Unassigned At Birth (UAB or UAAB), also seen as GUAB/SUAB (Gender/Sex Undesignated At Birth) or UGAB/USAB (Unassigned Gender/Sex At Birth) refers to someone who does not have an assigned gender at birth. It is most commonly designated with the letter "U". It is most commonly used by parents who are raising their children without a prescribed gender.

Gender-neutral parenting
There are studies that show that gender-neutral parenting has massive emotional and mental pros, and promotes development skills. It also is shown to help development of identity and promotes the child to learn about themself while they are young.

The cons to this approach comes mainly from society and the pushed gender roles within school, events, and friends. Besides these societal-formed issues, the UAB approach at parenting tends to have better results.

An article useful for facing the topic of gender-neutral parenting is listed here.

Pros to gender-neutral parenting

 * UAB children tend to show more creativity due to their freedom of expression.
 * UAB children do not feel restricted with choices of toys or clothes.
 * UAB children can relate to other genders, due to their exploration of items, clothes, and interests.
 * UAB children have a better sense of identity, even if they end up falling into the binary genders.
 * UAB children tend to be better leaders later in life.
 * UAB children do not have stereotypes or bias narrowing their views.
 * UAB children make choices without worry of their gender playing a role.

Cons

 * Due to society's push of gender roles, UAB children may grow confused within school or other locations that are gender-based.
 * Due to society's push of gender roles, UAB children tend to be bullied by children who are growing up under binary roles.

Flag
The flag appears to have been coined on March 3rd of 2019 by Tumblr user beyond-mogai-pride-flags. It has no confirmed meaning.

Resources

 * https://parenting.firstcry.com/articles/gender-neutral-parenting-is-this-a-right-approach/
 * https://www.parents.com/parenting/should-you-raise-a-gender-neutral-baby/
 * https://indianexpress.com/article/parenting/family/gender-neutral-parenting-will-help-children-develop-higher-emotional-intelligence-6163595/#:~:text=The%20pros%20of%20gender%2Dneutral,own%20capacities%20in%20more%20entirety.