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 a person as your dependent if all 3 of these statements are true: 1  They are a U.S. citizen, U.S. national, resident alien, or resident of Canada or Mexico. There is an exception for legally adopted children.