You can deduct the cost of preparing for delivery via childbirth classes. Again, to the extent that you are reimbursed by your insurance company (many will give you a refund if you attend a certain number of classes), you must exclude the reimbursement from your overall medical expenses.
What about supplies for your new baby? Effective as of the 2010 tax year, the IRS has ruled that taxpayers may use pretax dollars in their FSAs (flexible spending accounts) to cover the cost of breastfeeding supplies. If you don’t have an FSA, breastfeeding supplies are considered deductible as a medical expense. Breastfeeding supplies or “supplies that assist lactation” include breast pumps, bottles and pads.