How do you get 0 blood type?

You cannot change your blood type. You are born with what you are biologically given and it is permanent.

What happened was that dad and mom each passed both an O and an Rh negative to the baby. The end result is an O negative child. Each of their kids has around a 1 in 8 chance of having O negative blood. This is possible because both O and Rh- are something called recessive traits.

Explanation:

My trusty sidekick google, i hope it helps :) <3

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is correct hope this   also i learnd this in middle school