Line 35 on form 1040A

We received a letter from the IRS stating that we needed to correct some information. The information they need is from line 35 on form 1040A. It needs to match our other form of 8812. We do not see an error, and we are confsued. Should line 35 match the number of children we have, or should it be the amount of return we would receive for our 3 children (3,000), or should it be zero? Thank you for your help.

Raulpatricia