Women up to the 34th week of gestation can travel Space-A unless medically inadvisable by your doctor. Women who are 6 weeks or more post partum and infants at least 6 weeks old may travel unless medically inadvisable by your doctor. Infants under 6 weeks old and women who are less than 6 weeks post partum may travel if considered medically sound and so certified in writing by a responsible medical officer or civilian physician. Infants require a SSN or Passport as identity, If for some reason neither a SSN or Passport is available then the terminal "May" accept the DEERS number that is assigned to newborns until they get a SSN. The DEERS number can only be given to the sponsor in person. If going overseas to a foreign country then the infant needs a passport. If going to Guam then proof of U.S. Citizenship (Passport or Birth Certificate) is required.