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Chuekou (Mouth Pinching) syndrome is caused by the fetus contracting wind-heat pathogens in the womb, followed by exposure to wind pathogens after birth. The pathogenic factors enter the umbilicus and flow into the Heart and Spleen. However, conditions such as Taifeng (Fetal Wind) and Qifeng (Umbilical Wind) all lead to rapid breathing, a stiff tongue, and a mouth closed tightly like a pouch, preventing breastfeeding. Their etiology is similar, and their manifestations are identical. Upon onset, the face appears yellowish-red, the mouth pinches shut preventing feeding, breathing becomes rapid and labored, crying sounds are absent, the tongue is stiff, and the lips turn cyanotic. The mouth and facial muscles contract and gather, hindering nursing. Treatment should focus on dispersing and purging. Therefore, medical texts state: When a newborn is born, the blood vessels have not yet consolidated, and the muscles are still fluid-like; only when the blood coagulates and hardens can muscle and bone form. If the blood fails to regulate properly, normal muscle formation will not occur, resulting in a yellowish complexion and closed eyes with pinched mouth, which indicates that the blood vessels have failed to consolidate. This is ultimately due to the presence of wind-heat pathogens during gestation. After birth, if the Qi and Blood are unbalanced, bathing in drafts allows wind pathogens to invade the Heart and Spleen, leading to Chuekou. Due to blockage in the intestines and stomach, stagnation occurs in the middle jiao, causing abdominal distension, visible blue veins on the abdomen, pinched mouth, and inability to nurse. The condition is critical. If purgative treatment is not administered promptly, rescue is difficult. If the condition persists beyond one lunar month without improvement, accompanied by foaming at the mouth and cold limbs, it is considered incurable. Moreover, newborns possess vigorous vital energy, and pathology tends to be contained by this robust constitution. Upon observing these signs, immediate purgation is required. After recovery, mild tonification should be added; otherwise, damage to the root will result in lifelong illness.

Jinfeng (Wind Lock), Fengjin (Wind Stiffness), and Koujin (Mouth Lock) syndromes are all caused by heat-toxins contracted in utero, flowing into the Heart and Spleen, and further exacerbated by wind-pathogen invasion after birth. Symptoms include closed eyes, jaw stiffness, diminishing cry, inability to nurse, millet-grain-like nodules on the tongue, foaming at the mouth, red complexion, and a yellow nasal tip. If these appear within the first hundred days, it is termed "Juefeng Jin" (Desperate Wind Stiffness). These three conditions share similarities with Qifeng and Chuekou in symptoms and treatment methods, and are generally classified as malignant prognoses. If accompanied by convulsive jerking, jaw lock, and continuous bleeding from the umbilicus, death ensues. If an object resembling a snail or a white worm with a yellow head protrudes from the open mouth, internal administration of Zhuli (Bamboo Sap) and Niuhuang (Calculus Bovis) is indicated, along with external application of thinly sliced pork fat to dissipate the lesion. If white blisters are observed on the eyelids, they should be gently scratched open with fingernails and coated with Jingmo (Beijing Ink). Therefore, three diseases must be prevented in newborns: first, Koujin; second, Chuekou; third, Qifeng. All are acute conditions, with Koujin being the most severe. Survival is possible only if the condition resolves within one month. Thus, upon slight observation of jaw stiffness, difficulty nursing, diminished crying, and salivation, one must immediately examine the mouth and tongue according to previous methods, treat accordingly, and then administer medication. Although disease names may vary, their etiologies are identical. Qifeng, Chuekou, and Koujin typically arise within seven days of birth or within one month. Jinfeng and Fengjin are named based on their occurrence within one hundred days or before one hundred twenty days of age.