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.
In addition, a taxpayer cannot claim a person as a dependent if the person can be claimed as a dependent on another taxpayer's return. A dependent cannot claim his or her personal exemption if another taxpayer is entitled to do so.