When I went to efile I doubled and triple checked everything, but for some reason after filing it says my daughter only lived with me 7 months, why when it was put in it said 12months but now after fi

[vparedes95]

Why is there a mistake after checking it over and over and only after filing

[Critter]

First 7 is all you need for the credits ... so nothing would change if correct that number. 

Next as to how it happened ... most likely when you were reviewing in the interview mode ... when you were on that screen  you probably  went to  scroll down to click on the continue button but the cursor was on that entry box thus you accidentally changed the number of months ( too common a mistake I make a lot).  

Before you file always save a PDF and review the forms that way, do not use the interview process.  

[Carl]

why when it was put in it said 12months

There is no numeric selection for "12 months". The highest numeric selection is for 11 months. The selection above that is labeled "the whole year". (But it will show that as "12" months on the actual tax form itself.)