Study	Reason for exclusion
Englund 1995	Study does not have concurrent control group.
Henkle 2010	Study was done to assess the incidence of influenza virus infection in the non‐vaccinated study arm of a previously conducted trial.
Holmlund 2011	Study vaccinated infants with pneumococcal and Haemophilus influenzae type B (Hib) vaccines along with the maternal immunisation and was done primarily to assess the impact of pneumococcal vaccine.
Jackson 2011	Study compared vaccinations with 2 different doses of influenza vaccine.
Madhi 2011a	Study evaluates the safety and immunogenicity of trivalent influenza vaccine in HIV‐infected pregnant women.
Moniz 2010	Study does not evaluate the outcome of interest that is maternal, newborn and child health outcomes but rather focuses on vaccine knowledge and uptake with text messaging.
Mulholland 1996	Study did not have a suitable placebo/control group.
Munoz 2001	Study did not have a suitable placebo/control group.
NIAID 2009a	Study compares 2 strengths of the H1N1 influenza vaccine.
NIAID 2009b	Study compares two different types of Flu vaccines (Fluzone® or Fluarix®)
NIAID 2009c	Study compares different strengths of the vaccine.
NIAID 2010	Study compares three different types of flu vaccines.
Omer 2013	Study evaluated the combined effects of antenatal influenza vaccination by mothers and pneumococcal conjugate vaccine receipt by infants.
Quiambao 2003	Study was done primarily to study pneumococcal vaccine through a cross‐sectional survey.
Quiambao 2007	Study was done primarily to study pneumococcal vaccine.
Schlaudecker 2013	Study did not have a suitable placebo/control group.
Stockwell 2014	Study evaluated the impact of influenza vaccine text message reminders in a low‐income obstetric population
Tarrant 2013	Study does not evaluate the outcome of interest that is maternal, newborn and child health outcomes but rather focuses on vaccine knowledge and uptake after a brief education session.
Wong 2014	Study is designed to assess the effectiveness of a brief educational intervention in improving the uptake of seasonal influenza vaccine among pregnant women in Hong Kong.
Wootten 2010	Study compares methods for consenting on influenza vaccine uptake rate in pregnant women.
Zaman 2008	Study did not have a suitable placebo/control group.