Pre-term babies, those born before week 37 weeks of gestation, are more susceptible to invasive infections than full-term babies. The smallest babies born “extremely” premature (those born before 32 weeks, or approximately 1,500 grams or less of birth weight) suffer the greatest burden of infection among all age patient age groups in BC and other developed countries in general. About one in four “extremely” pre-term babies suffers from an invasive infection, which adds up to more than 8,760 new invasive infections in North America each year.