SWISHER — A woman and her newborn child were injured by an exploding firework Saturday night.According to the Johnson County Sheriff’s Office, deputies were called to 1455 Curtis Bridge Road NE in Swisher at 9:50 p.m. for a report of two people injured by fireworks. Authorities said 36-year-old Margaret Limkemann, of Cedar Rapids, was holding her one-month-old daughter, Aria, and were injured when a firework launched sideways instead of upward and hit Margaret.Limkemann attempted to remove her daughter before the firework exploded, authorities said.