The"tax break" for breast feeding would come under the Medical Expense deduction, which is pretty hard to get. You can enter any lactation supplies you paid for such as a breast pump, etc.
The medical expense deduction has to meet a rather large threshold before it can affect your return. The amount of medical expenses that will count toward itemization for someone under 65 is the amount that is OVER 10% of your adjusted gross income; for someone 65 or older it would be the amount over 7.5% of your AGI.
You should only enter the amount that you paid in 2016—do not include any amounts that were covered by insurance or that are still outstanding. Of course, your medical expenses plus your other itemized deductions still have to exceed your standard deduction before you will see a difference in your tax due or refund.
To enter your medical expenses go to Federal>Deductions and Credits>Medical>Medical Expenses
**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.**
