In TurboTax Desktop, though the interview screen does change the number of months to "6" if you enter "0", if you switch to Forms Mode and look at the Dependency/EIC Smart Worksheet, it shows "0" as the number of months the dependent lived with you if that is what you entered.
TurboTax Desktop will also show the dependent on the Form 1040 if you answered the interview questions indicating that you are claiming the dependent under a legal agreement with the other parent.
See this TurboTax tips article for more information about Form 8332.
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