A recent FDA review found there was "insufficient data" regarding a factor of Pfizer's vaccine.<br />There isn't enough info to conclude whether Pfizer's coronavirus vaccine is safe for kids under 16.<br />There also isn't enough info regarding pregnant women and immunocompromised people.<br />Experts also worry about vaccinating people who previously got COVID-19, says Business Insider.<br />Some of these vulnerable groups were included in Pfizer's late-stage clinical trials, which are ongoing.<br />However, the FDA advisory committee has decided to recommend the shot for emergency use.