Below is a sample of H1N1 vaccine recommendations with respect to pregnant women and children only (the websites have recommendations and rationale for the entire population):
The United States Centers for Disease Control recommends that pregnant women and all people from 6 months through 24 years of age receive the 2009 H1N1 influenza vaccine.
Public Health Agency of Canada advises that pregnant women and children 6 months to under 5 years of age will benefit most from the H1N1 vaccine.
The World Health Organization recommends that priority for the vaccine should be given to pregnant women, followed respectively by people over 6 months of age with chronic health conditions, healthy people age 15 to 49 and then healthy children.