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 vortex produced by the left wing rotates in a clockwise direction when seen from behind. The one from the right rotates counterclockwise. Larger airplanes produce stronger vortices because the wings produce more lift to support the weight of the airplane. The vortices settle behind the aircraft to an altitude about 1,000 below the aircraft's flight path, where they tend to remain.