By Jessica DiNapoli NEW YORK (Reuters) -Perrigo Company PLC, which makes store-brand baby formulas for retailers including Walmart Inc and Amazon.com Inc expects shortages and heightened demand to last for the “balance of the year,” said CEO Murray Kessler in an interview with Reuters. Perrigo’s formula manufacturing facilities in Ohio and Vermont are now running at 115% of capacity, Kessler said. At the request of the U.S. Food and Drug Administration, the company is making only four items, the store-brand versions of Similac Pro Sensitive and Pro Advance and Enfamil Gentle Ease and Infant, K…