Do all breastfeeding materials count as medical expense deductions? I attempted to breastfeed for a long time and the expenses added up

The IRS says:

"You can include in medical expenses the cost of breast pumps and supplies that assist lactation. This doesn’t include the costs of excess bottles for food storage."

Yes, breast pumps and supplies that assist lactation can be deducted on Schedule A as a medical deduction if you itemize your deductions instead of taking the Standard Deduction and your unreimbursed medical care expenses would have to exceed 7.5% of your adjusted gross income.

For more info, refer to the TurboTax articles:  The Ultimate Medical Expense Deductions Checklist, and Are Medical Expenses Tax Deductible?

Refer to the IRS article Lactation Expenses as Medical Expenses  for more information.