Production of baby formula has resumed at the Abbott Nutrition factory in Michigan whose February shutdown over contamination contributed to a national shortage, a company spokesman said. Damage from severe thunderstorms including flooding had forced the Sturgis plant to halt operations in mid-June just two weeks after restarting production with additional sanitizing and safety protocols. Production of EleCare, a specialty formula for infants with severe food allergies and digestive problems, was restored at Sturgis following a July 1 reboot, said Abbott spokesman John Koval. “We are working t…