Normal children may be dysfluent at any time butter likely to increase their dysfluencies when they are tired, excited, upset or being rushed to speak. The dysfluencies may appear in a cycle meaning that they may increase in frequency for several days or weeks and then be hardly noticeable again for weeks or months and could return again following this until the behavior is outgrown. Usually, children with normal dysfluencies such as these appear to be unaware that they are occurring and show no signs of surprise or frustration. It is evident that the child is not struggling to speak but rather taking more time to complete a thought or sentence. See also
ADHD
Aphasia
Articulation disorder
Child development
Language disorder
Learning disability

References
Sources
Trubo, Richard (2001). "Stuttering". The New Book Of Knowledge - Health and Medicine: 112–123. United States of America: Grolier Incorporated. ISBN 0-7172-0608-4. Note: This annual was also published under the title The 2001 World Book Health & Medical Annual, United States of America: 2001 World Book, Inc.
Stuttering (disfluency). Cincinnati Childrens. (n.d.). Retrieved November 22, 2021, from [1]. Watkins, Kate E.; Smith, Stephen M.; Davis, Steve; Howell, Peter (2008). "Structural and functional abnormalities of the motor system in developmental stuttering". Brain. 131 (1): 50–59. doi:10.1093/brain/awm241. PMC 2492392. PMID 17928317.
In 2004, the FAA introduced the "Light-sport aircraft" category, which resembles some other countries microlight categories. Ultralight aviation is represented by the United States Ultralight Association (USUA), which acts as the US aeroclub representative to the Fédération Aéronautique Internationale. Types
There are several categories of aircraft which qualify as ultralights in some countries:

Fixed-wing aircraft: traditional airplane-style designs. Weight-shift control trike: use a hang glider-style wing, below which is suspended a three-wheeled carriage which carries the engine and aviators. These aircraft are controlled by pushing against a horizontal control bar in roughly the same way as a hang glider pilot flies. Powered parachute: fuselage-mounted engines with parafoil wings, which are wheeled aircraft. Powered paraglider: backpack engines with parafoil wings, which are foot-launched. Powered hang glider: motorized foot-launched hang glider harness. Autogyro: rotary wing with fuselage-mounted engine, a gyrocopter is different from a helicopter in that the rotating wing is not powered, the engine provides forward thrust and the airflow through the rotary blades causes them to autorotate or "spin up" thereby creating lift. Helicopter: there are a number of single-seat and two-place helicopters which fall under the microlight categories in countries such as New Zealand. However, few helicopter designs fall within the more restrictive ultralight category defined in the United States of America. Hot air balloon: there are numerous ultralight hot air balloons in the US, and several more have been built and flown in France and Australia in recent years.