 The primary objective of this observational, comparative safety study is to evaluate the safety of the Novartis Pandemic Influenza A H1N1 vaccine in pregnant women and their off spring, followed for up to 3 months of age as compared to pregnant women who have not received the Novartis Pandemic Influenza A H1N1 vaccine. This study will be conducted at investigative sites within the Netherlands, Italy, and Argentina. 