View full size image. How long a healthy pregnancy lasts can vary by as much as five weeks, even when doctors precisely determined the date of conception, a new study suggests.
Exemptions for dependents. You can usually claim an exemption for each of your dependents. A dependent is either your child or a relative who meets a set of tests. You can't claim your spouse as a dependent. You must list the Social Security number of each dependent you claim on your tax return.
You can claim one exemption for each dependent. A dependent exemption is technically different from a tax deduction for dependents, because an exemption is subtracted from your adjusted gross income before your taxable income is calculated (after that, tax deductions are subtracted from your taxable income).