Yes, you may use funds in your HSA to pay for lactation aids for your spouse.
Lactation aids like breast pumps are a qualified medical expense listed in Publication 501.
Qualified medical expenses for an HSA are those incurred by the following persons.
- You and your spouse.
- All dependents you claim on your tax return.
- Any person you could have claimed as a dependent on your return except that:
- The person filed a joint return,
- The person had gross income of $4,050 or more, or
- You, or your spouse if filing jointly, could be claimed as a dependent on someone else's 2016 return.
Please see IRS Publication 969.