Not sure what tax break you think is affected by being two instead of three. But the software is going by the date of birth you entered, and it cares how old she was at the end of 2018. If she turned three in 2019, that is irrelevant to your 2018 tax return.
What are you working on that is being affected by your child's age?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
