Sparrow's parents decided to raise their baby without a known sex, giving Sparrow the option to choose gender free from stereotypes.

However, some families are exploring another option by raising a "gender neutral" child.

Others opt for the surprise, waiting to hear, "it's a boy" or 'its a girl."

Many parents find out the sex of their child before the baby is born.

Sparrow is a smiling, curious, adorable 11-month-old baby. If you met Sparrow, you might ask if Sparrow is a boy or girl.

"We did not assign a sex at birth which means when they were born, they had genitals, we know what they are, we just chose to acknowledge that those genitals don't indicate anything about gender," Dennis said.

This parenting philosophy means only the parents and trusted caregivers know the baby's anatomy. They believe the gender part comes later and is left up to the child. Ari Dennis is one of those parents.

Instead of "boy" or "girl", gender neutral babies are known as "theybies". "Theybies" refer to babies without a known sex.

Chapter two : Gender-neutral parenting

Sparrow's parents decided to raise their baby "gender-neutral," meaning Sparrow will decide gender when older. Even Sparrow's birth certificate says sex-unknown.

Ari, one of Sparrow's parents, says the family was inspired to raise Sparrow without a known gender after their older child, Hazel, discovered gender around the age of four.

"We are in no way prohibiting Sparrow from having a gender, and we're not forcing them to be one gender or another," Dennis said.

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Sparrow's family isn't alone. A closed Facebook group called "Parenting Theybies" has roughly 350 members. Ari is also a prominent voice in the gender-neutral parenting community.