In order to qualify for a license, a gym teacher must have a minimum of a bachelor's degree and pass competency examinations covering both general education and topics pertaining to their area of specialty. After a teacher is licensed, they must also meet continuing education requirements set by their state.
Mistake #3: Keeping mixed formula out too long. Formula that is sitting out at room temperature must be thrown away after 1 hour. If it is in the refrigerator, pre-mixed formula (also called ready-to-feed formula) that is opened must be thrown out after 48 hours. Formula that you mixed must be thrown out after 24 hours. Mistake #4: Re-using leftover formula.
So, DO NOT use baby formula after the manufacturer recommended use by date. Infant formula is the only food product mandated by the U.S. Food and Drug Administration (FDA) to print a use by date. If formula is stored too long, it begins to separate and can clog the nipple of a baby bottle. The shelf life of properly stored baby formula, like Enfamil or Similac, is: