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How to change child custody
Talk to the other parent.
If you are on good terms with the other parent, work together to adjust the parenting plan so that it suits both of your needs and the needs of your child. Print out your new, which you will need to submit to the judge.
Child custody decisions typically need to be modified every two or three years anyway as the child grows. Two parents who are able to come to an agreement rationally will have a much easier time co-parenting.