(Reuters) -Abbott Laboratories said on Saturday that it has reopened its baby formula production plant in Sturgis, Michigan, taking a step toward alleviating an acute nationwide shortage that has sent parents scrambling for supplies. The company said it will begin production of EleCare and other specialty and metabolic formulas, with initial EleCare product release to consumers beginning on or about June 20. The U.S. Food and Drug Administration said on May 19 that the plant was on track to open within one or two weeks. The facility will open after meeting initial requirements agreed to with t…