You should have a doctoral degree in psychology. If you are planning to work as a clinical, counseling or school psychologist, it's likely that you will also need an extra year of supervised post-doctoral experience.
you need to go to college for 4-8 years to become a psychologist.
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You Need a Ph.D.
Although it MAY be possible to become a developmental psychologist with a MA in psychology or child psychology, it is more probable that you will need to attain a PhD. (This amounts to 7-8 years of higher education, on average)
to become a psychologist you need to get a PhD