Weaning Your Baby Onto Solids. The term 'to wean' comes from an ancient phrase that means 'to accustom to'. So weaning refers to the period during which an infant gradually becomes accustomed to food other than milk (breast or formula). Up until 6 months of age, breast or formula milk alone is nutritionally adequate.
Occasional airplane vibration during flight is not unusual. There are many causes of airplane vibration, including landing gear extension and retraction, extension of speed brakes, free play in movable surfaces, and systems malfunctions.
The vibration of the strings causes the soundboard (top) of the guitar to vibrate in a similar manner. The vibration of the soundboard then causes the air inside (and around) â¦ the guitar to vibrate...the vibrations of the air is what you hear.and what you hear is known as a sound wave or sound waves.