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Neonatal teeth. Natal teeth are teeth that are present above the gumline (have already erupted) at birth, and neonatal teeth are teeth that emerge through the gingiva during the first month of life (the neonatal period). [1][2] The incidence of neonatal teeth varies considerably, between 1:700 and 1:30,000 depending on the type of study; the ...
Microtia is a congenital deformity where the auricle (external ear) is underdeveloped. A completely undeveloped auricle is referred to as anotia. Because microtia and anotia have the same origin, it can be referred to as microtia-anotia. [1] Microtia can be unilateral (one side only) or bilateral (affecting both sides).
Human vestigiality. The muscles connected to the ears of a human do not develop enough to have the same mobility allowed to monkeys. Arrows show the vestigial structure called Darwin's tubercle. In the context of human evolution, vestigiality involves those traits occurring in humans that have lost all or most of their original function through ...
For human teeth to have a healthy oral environment, all parts of the tooth must develop during appropriate stages of fetal development. Primary (baby) teeth start to form between the sixth and eighth week of prenatal development, and permanent teeth begin to form in the twentieth week. [1] If teeth do not start to develop at or near these times ...
Humans have four types of teeth: incisors, canines, premolars, and molars, which each have a specific function. The incisors cut the food, the canines tear the food and the molars and premolars crush the food. The roots of teeth are embedded in the maxilla (upper jaw) or the mandible (lower jaw) and are covered by gums.
Caul. A caul is a piece of membrane that can cover a newborn 's head and face. [1] Birth with a caul is rare, occurring in less than 1 in 80,000 births. [2] The caul is harmless and is immediately removed by the attending parent, physician, or midwife upon birth of the child. [citation needed] An en-caul birth is different from a caul birth in ...
In Latin cultures, she explains, infant female ear piercing is routine. "In Mexico, it's customary to have girls' ears pierced at the hospital before they are discharged," she says. "I wanted my ...
Premature babies from young mothers are more likely to have neurological defects that will influence their coping capabilities – irritability, trouble sleeping, constant crying for example. There is an increased risk of Down syndrome for infants born to those aged over 40 years. Young teenaged mothers (younger than 16) and mothers over 35 are ...