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Genetically, a boy has XY chromosomes and a girl has XX chromosomes (apart from some genetic disorders that you would probably already know about if you had them), so you can run a DNA test if that level of certainty is needed. Otherwise, a boy will have a penis and testicles and a girl will have a vagina (and ovaries inside).
Now, sometimes people are born with something called "ambiguous genitalia," and this means that they were born with genitals that didn't end up developing in the same way as most people's genitals do. In these cases, a DNA test should be done to make sure that you don't socialize someone to the correct sex. Some people are born with genetic conditions such as intersex (which used to be called hermaphroditism) or "disorders of sex development" (DSD). A doctor can go through the varies forms of DSD and help a person with a DSD to determine if they are a boy, a girl, or something in between or combined--and if so how to deal with that in a way that has a good outcome for that person.
What else can I help you with?
How can you tell if your tirtle is a boy or a girl?
how do i tell if my my turtle is a girl or a boy?...
How can you tell if catapilar is a boy or a girl?
you cannot tell if the caterpillar is boy or girl
How can you tell if a starfish is a boy or girl?
YOu can not tell the difference between a girl or boy starfish.
Which is harder to tell if a boy or a girl like you?
its harder for a boy to tell if a girl likes him
How can you tell if a fish is a boy or girl by the tail?
can you tell if a fish is a boy or girl by the tail
How do you tell if a Oscar is a girl or a boy?
by asking its mother if it is a girl or a boy and plus you can tell by the face
How do you tell if grasshoppers are a boy or girl?
you can tell if its a girl or a boy byits butt or eyes. if its a girl, it will have small pupils. if itsa boy, it will have large pupils.
How can you tell if a bluegill is a boy or girl?
i don't know if it is a boy or a girl
Do boys tell girls that they love them or do girls tell boys?
It can be either way, a girl can tell a boy that she loves him or a boy can tell a girl that he loves her.
How do you tell if a salamnder is a boy or girl?
You can tell by the tail if the tail is short than its a girl if the tail is long its a boy!
How do you tell a baby bunny is a boy or a girl?
You can tell whether or not your rabbit is a boy/girl by looking under its butt.
How can you tell if your is a boy or a girl?
If you have a penis your probably is a boy.
