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.
How long does baby formula last? Baby formula lasts for 24 hours once opened. Prior to opening, check the package for a use by date and adhere to that date. This is because Baby Formula is a very precisely made product that contains all the nutrients that newborns need. Nutrients deteriorate with time and need to be at a certain level for proper infant development.