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Pediatric medicine is known as the "Mute Department" because infants cannot speak and pulse diagnosis is difficult to perform; thus, complexion and physical form serve as the primary basis for diagnosis. Physicians must exert their utmost mental effort in treatment. Therefore, those who are skilled at nurturing children care for them with caution akin to raising dragons, while those unskilled treat them with excessive affection like a cow licking its calf. The more diligent the love, the more urgent the harm. A sudden warmth of the head with cold feet, or frequent crying without nursing, represents a slight deviation that can lead to a thousand-mile error if mishandled. This specialization in pediatric medicine compensates for the limitations of natural parental instinct.

Infants have fragile stomach qi, making them susceptible to dietary injury; their bones and sinews are soft, making them vulnerable to wind-cold invasion. Parents often lack knowledge in this regard. Neglecting care too loosely, or dressing too warmly and bundling too tightly, can assist yang heat and consume yin fluids. Indulging in food and overfeeding merely damages spleen qi and harms the stomach. Exposure to strange sounds or objects without prevention, or keeping the child in deep seclusion with minimal outings, is overly meticulous. Allowing walking and standing before one year of age and praising growth, or calling normal playfulness "cleverness," leads to problems. Once illness strikes, parents become anxious, distrusting doctors but trusting shamans, seeking ghosts instead of medical help. This reflects a failure in human effort, wrongly attributed to destiny.

To observe qi and color, one must first distinguish locations: The left cheek belongs to the Azure Dragon (Liver); the right cheek belongs to the White Tiger (Lungs). The high forehead corresponds to Li Fire (Heart); the low chin corresponds to Kan Water (Kidneys). The nose is in the center of the face, connecting with Spleen Earth qi. Observing the manifested colors reveals the origin of the disease. Furthermore, the Spleen manifests in the lips, the Lungs connect through the nose, the tongue is the sprout of the Heart, and the eyes are the fluid of the Liver. The Stomach meridian flows to both cheeks, and the Kidneys open into the ears. Nails are the surplus of sinews, governed by the Spleen's transportation; hair is the surplus of blood, governed by the Kidneys. The Spleen controls the hands and feet, and the Kidneys connect to the teeth. If the Zang organ is weak, its corresponding parts will show fatigue first. Being able to discern form and color is like striking a bell clearly; being ignorant of signs is like throwing a stone into water silently.

Observing the exterior reveals the interior. Bright red indicates steaming heat; exposed blue-green indicates fright and palpitations. Black like coal indicates Zhong E (sudden severe illness); yellow like an orange indicates Spleen deficiency. White indicates Gan accumulation or consumption; purple indicates extreme heat. Blue-green covering the corners of the mouth is difficult even for Bian Que to treat; black covering the Taiyang area is untreatable even by Lu Yi. Red light on the Nianshou (area below the nose) suggests pus and blood disorders; green on the Shangen (root of the nose) suggests frequent calamities. Observing color to know the cause does not require following a map to find a horse.

The Vermilion Bird (Heart Fire) penetrating the pupils (Kidney Water) indicates fire entering the water region (Fire overcoming Water). The Azure Dragon (Liver Wood) extending to the Si Bai (Spleen area) indicates Liver overacting on Spleen and Stomach. Diarrhea with yellow stool requires vigilance; coughing with blue phlegm is fearsome. Severe abdominal pain often presents with a blue face and contracted lips. Impending convulsions first show red cheeks and staring eyes. Flaming fire-like symptoms indicate external wind-cold; floating metal-like symptoms indicate internal accumulations. Alternating yellow and white indicates lingering Gan heat; alternating blue and red indicates urgent wind pathogen. Precise observation leads to proper treatment. Crow-like voice and fish-mouth breathing waste effort; broken flesh and dry skin exhaust energy.

Changes in qi and color alter appearance. Qi deficiency causes the fontanelle to sink; Blood deficiency causes hair to become brittle. Excessive eye discharge and dry eyes indicate Liver wind; drooling indicates Cold stagnation in the Spleen. Puffy face and eyes indicate distension and asthma; furrowed brows indicate abdominal pain and crying. Ascaris accumulation indicates gradual Spleen-Stomach decline; fistula sores indicate initial anal/rectal deficiency. If vertigo-like symptoms are not treated, even immortals cannot help.

Hands counting objects suggest impending convulsions; a face painted red indicates blazing Heart Fire. Preferring cool sitting/lying indicates attacking irritant heat; seeking warmth by stretching indicates fear of wind-cold. Large belly and small legs indicate Spleen exhaustion leading to Gan; wide-open eyes and mouth indicate critical condition and inevitable death. Tongue protrusion indicates Spleen heat; delayed closure of fontanelles (Jie Lu) indicates Kidney exhaustion. Double tongue and wooden tongue indicate Heat accumulation in Heart and Spleen; choking and panting indicate flaming fire floating in Liver and Lungs. Certain rashes indicate tooth gangrene. Buping Dingxi (emaciation) often stems from food accumulation; dry lips and thirst with borborygmus and spontaneous diarrhea occur. Night crying is divided into four syndromes; Bian Zheng (physiological fever in infants) cycles within a year. Heart heat causing inability to speak; Spleen deficiency causing drowsiness. Loss of voice after illness indicates Kidney weakness; loss of voice after coughing indicates Lung flaccidity. Abdominal pain with clear water indicates parasites; abdominal pain with sour-smelling stool indicates accumulation. Frequent lip pursing indicates Spleen deficiency; prolonged tongue extension indicates blazing fire. Turtle chest indicates Lung fire swelling the chest; turtle back indicates Kidney wind entering the marrow. Dry, black, and cracked nose indicates Fire excess and Metal deficiency; large belly with visible veins indicates Wood strength and Earth collapse.

Dan tumors, sores, and scabies are lingering fetal toxins; vomiting, diarrhea, malaria, and dysentery are sticky food accumulations. Inability to suck milk indicates Heat in Heart and Spleen; desire to lie prone indicates Fire steaming intestines and stomach. Preference for looking at lamps indicates Heart irritant heat; craving dirt indicates Gan heat in Spleen. Abdominal pain from cold invasion; mouth ulcers from Heat accumulation. Umbilical tetanus is feared at one year; Fire Dan is feared at one year. Fright comes from Heat; Dysentery results from Phlegm. Vomiting/diarrhea with spirit depletion is critical; Malaria/Dysentery with reduced appetite leads to emaciation.

Fright originates from the Heart; Wind arises from the Liver. Convulsions differ by side, indicating favorable or unfavorable patterns; medicines differ by tonifying or purging, matching deficiency or excess. Acute fright results from deep accumulated heat, requiring cooling purgation; Chronic fright follows major illnesses, requiring warming tonification. Head shaking, eye wandering, and panting are untreatable even by experts; locked jaw, flaring nostrils, and cold feet render divine pills useless. Closed eyes indicate soul loss; wild screaming indicates demonic influence. Inability to swallow indicates approaching death; worsening confusion leads to demise. Having understood the symptoms, regulation is necessary.

For fetal toxin, use Licorice Root and Coptis Rhizome; for food accumulation, use Atractylodes Macrocephala Rhizome and Immature Bitter Orange. For acute fright convulsions, use Decoction for Draining the Heart and Decoction for Purging the Liver; for chronic fright regurgitation, use Tonify the Middle and Boost Qi Decoction. Ji Sheng Pill removes Gan; Bei Ji Pill treats accumulation. Bao Long Pill resolves phlegm and calms fright; Wei Ling Pill tonifies Spleen and opens the stomach. For night crying, clear heat and calm the Heart; for afternoon fever, nourish blood and raise qi. Lizhong Decoction stops diarrhea; Xianglian Pill stops dysentery. If accumulated heat persists, Liang Jing Pill is highly effective; for deep cold, Yang Pi Pill is secret. For phlegm-fire attacking, use San Huang Wan; for undigested food/water, use Yi Li Dan. Bupleurum and Scutellaria treat malaria; Yue Chan Wan reduces masses. Jinhua Pill treats tidal fever; Yuye Tang treats coughing. Sesame treats sores/scabies; Liang Ge San treats Dan tumors. For vomiting/diarrhea with thirst, use Atractylodes; for irritant heat with thirst, Yuanyuan Powder is best. For macules/rash, use detoxification; for abdominal pain, treat Spleen accumulation. For epistaxis/hemoptysis, use Hemp Flower; for double/wooden tongue, use acupuncture. For persistent mouth ulcers, use Xi Xin Decoction; for abdominal distension/anorexia, use Ping Wei San. Wu Ao Decoction treats wheezing; Si Ling Powder promotes urination. To reduce jaundice/swelling, modify Wei Ling Decoction; to break accumulation and calm worms, use Ji Sheng Pill.

Generally, infants easily shift between deficiency and excess. Regulation seeks balance; tonification and purging should not exceed dosage. Ba Dou (Croton Seed) is especially forbidden; metallic/mineral drugs should be used sparingly. Pungent-hot herbs move qi and consume yin; bitter-cold herbs damage yang and harm the stomach. For food accumulation, resolution must not be delayed; for deficiency/emaciation, tonification is urgent. Any delay leads to consumptive death.