Is maternity uniform considered a disability related expense?

No, the IRS does not consider pregnancy a disability.

However, you may be able to deduct them as a job related expense if they are required for your job. 

To enter your job related expenses in TurboTax:

• Select Federal Taxes (Personal in the Home & Business edition).
• Select Deductions & Credits, and in the next screen, click "I'll choose what I work on."
• Scroll down the Deductions & Credits screen until you see the Employment Expenses group.
• Click on the Start/Update button next to the Job-Related Expenses category.
• Follow the prompts.

Please note that you can only deduct the portion of expenses that exceed 2 percent of your adjusted gross income. To find out more about the 2% rule, see the article below:

https://ttlc.intuit.com/replies/4800344