How many months must my dependent child be a full time student to be claimed as a dependent? She lived with me the entire year

[Opus 17]

At least 1 day in each of 5 different months.  So being a full time student in the spring semester only (Jan to May) or fall semester only (Sept to Dec) counts.

[taxes4shelby_201]

Is this just for college or is high school included also.

[SweetieJean]

The 5 month rule does not apply if the child was under age 19 on 12/31/2017.