This can be based on your availability, but feeding twice a day rather than just once tends to help the pet feel full for longer.  Puppies need to eat at least three times a day when they’re under 5 months because they are rapidly growing, need constant energy, and they haven’t developed enough to have a means to store energy.  If you are not available to feed more than once, it is okay to leave food out, but remember to measure out the daily requirements – no more than this!