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In the first hundred days after birth, if the infant feels cold in the mouth and abdominal pain, experiences shivering and trembling of the body, frequently trembles, curls the legs and clenches the fists, cries incessantly day and night, or has a locked jaw that cannot open, this is named Fetal Cold (Tai Han). The etiology involves premature delivery due to maternal abdominal pain during pregnancy; as the classics state: "Fetal cold is often accompanied by abdominal pain." It may also result from the mother's preference for sweet, fatty, raw, or cold fruits, or from external contraction of Wind, Cold, Summerheat, or Dampness prior to conception, treated with cooling herbs that internally injure the fetal Qi. Consequently, the newborn sleeps lethargically, occasionally regurgitates milk curds or passes white loose stools. If not treated early, it will inevitably develop into Slow Convulsion (Man Jing) or Slow Spleen Wind (Man Pi). For such presentations, Chonghe Yin (Harmonizing Decoction) and Danggui San (Angelica Decoction) should be combined and decocted with water-warmed ginger to induce mild diarrhea. Once diarrhea occurs, Yunqi San (Regulating Qi Powder) should be administered to regulate and tonify. After diarrhea ceases, Qi becomes balanced, Spirit is calm, pain subsides, and limbs extend, Shenling Baizhu San (Ginseng, Poria, and Atractylodes Macrocephala Powder) should be used to nourish Stomach Qi, while Baishaoyao Tang (White Peony Decoction) should be employed to dispel Cold-Dampness. The nursing mother should avoid raw, cold, and iced foods and drinks to facilitate recovery.

Another condition presents with slightly cold hands and feet, slightly cyanotic lips and face, sweating on the forehead, refusal to nurse or eat, and increased crying at night, resembling the above syndrome but without cold mouth or chills; this is named Visceral Cold (Zang Han). This disease is heavier at night and lighter during the day, accompanied by abdominal pain, borborygmus, and watery diarrhea, sometimes without diarrhea. This condition also occurs within the first hundred days, caused by prolonged exposure to cold air during labor, washing the infant with cold water ginseng soup, short umbilical cord ligation that is not tight enough, allowing Cold Qi to invade. Bai Shaoyao Tang and Chonghe Yin added with salt-fried Huixiang (Fennel Fruit) and Zhuyu (Evodia Fruit), decocted with water and fresh ginger, are indicated, and the nursing mother should take them concurrently. [Tang] If an infant harbors Cold in the womb and, after birth, fails to receive proper care leading to secondary Wind injury, symptoms include cyanotic-white complexion, cold extremities, tremors of hands and feet, and locked jaw, which are due to Fetal Cold. Alternatively, Cold may enter the Zang organs through deficiency, causing abdominal pain and Pan Chang Nei Diao (intense abdominal pain resembling intestinal retraction; see treatment under "Cold Abdominal Pain").

Chonghe Yin, Danggui San (see "Tidal Fever"), Baishaoyao Tang (see "Hernia"), Yunqi San (see "Hernia"), Shenling Baizhu San, Yigong San (Xue Shi used this formula to treat Fetal Cold).