《千金》论曰∶凡断脐不得以刀子割之，须令人隔单衣物咬断，兼以暖气呵七遍，然后缠结所留脐带，令至
儿足趺上，短则中寒，令儿腹中不调常下痢。若先断脐然后浴者，则脐中水，脐中水则发腹痛。其脐断讫，
连脐带中多有虫，宜急剔拨去之，不尔，入儿腹成疾。断儿脐者，当令长六寸，长则伤肌，短则伤脏。若不以
时断及 汁不尽，则令暖气渐微，即自生寒，令儿脐风。（《千金翼》《圣惠》与古来方断脐裹脐语皆同。）
《婴童宝鉴》论小儿断脐云∶凡小儿生下可先浴而后断脐，及可以衣衬而口啮之，不然则刀断。如刀断者，
则以剪刀先于怀中厌令暖方用。又断之则脐带不可令长，只如子足长短，短即中寒而伤脏，长即伤肤。先断而
后洗，即令水入脐中，孩子多天 痛苦，啼叫面青黑，为中水患也。脐若短即腹中不调常下痢，有中寒之患。
其脐不可伤动，伤动即令久不干，如不干即伤外风，伤外风即口噤，小儿不可救也。
《秘要指迷》论曰∶婴儿初生剪去脐带，切令剪刀暖，不可伤冷及外风所侵。
《庄氏家传》烙脐丸
豆豉 黄蜡（各一分） 麝香（少许）
上同捣，令烂熟捻作饼子，断脐讫安脐上，灸三壮，艾炷如小麦大。若不啼，灸至五、七壮，灸了以封脐
散封之。不得湿着，恐令脐肿。（封脐散方在裹脐门中。）
《千金方》论述说：凡是剪断脐带，不能用刀子直接切割，必须让人隔着单衣咬断，并且用暖气呵气七遍，然后缠绕结扎留下的脐带，使其长度到达婴儿脚背处。如果太短，会导致寒气侵入，使婴儿腹部不调和，经常腹泻痢疾。如果先剪断脐带再洗澡，那么水会进入脐中；水进入脐中就会引发腹痛。脐带剪断后，连着的脐带内部往往有虫子，应当立即剔除拨除，否则虫子进入婴儿腹内会致病。剪断婴儿脐带时，应当保留六寸长，太长会损伤肌肉，太短会损伤内脏。如果不及时剪断以及脐汁排不尽，就会导致暖气逐渐微弱，自然产生寒邪，使婴儿患上脐风。（《千金翼方》与《太平圣惠方》以及古来关于断脐、裹脐的方语都相同。）
《婴童宝鉴》论述小儿断脐时说：凡是小儿出生，可以先洗澡然后再断脐，也可以用衣服衬垫后用口咬断，不然就用刀剪断。如果用刀剪断，就要先用剪刀在怀中捂暖了才使用。另外，剪断后脐带不可留得太长，只需像婴儿脚的大小长短即可，太短就会中寒伤及内脏，太长就会损伤皮肤。先剪断再洗澡，就会让水进入脐中，孩子多遭受痛苦，啼哭叫喊面色青黑，这是中了“水患”。脐带如果太短，就会腹部不调和经常腹泻痢疾，有中寒的祸患。脐部不可受到触动，一旦触动就会久久不干，如果不干就会受到外风侵袭，受到外风侵袭就会牙关紧闭（口噤），小儿就不可救治了。
《秘要指迷》论述说：婴儿初生剪去脐带，务必让剪刀温暖，不可受冷及被外风侵袭。
《庄氏家传》烙脐丸方：
豆豉、黄蜡（各一分）、麝香（少许）。
以上药物一同捣碎，令其烂熟捻成饼状，断脐后放在脐上，灸三壮，艾炷大小如小麦。如果不啼哭，灸到五、七壮，灸完后用封脐散封住。不得弄湿，恐怕导致脐部肿胀。（封脐散的方子在裹脐门中。）
The *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold) states: When severing the umbilical cord, one must not cut it with a knife. Instead, it is necessary for someone to bite through it while separated by a single layer of clothing, and simultaneously blow warm breath into the area seven times. Then, the remaining umbilical cord should be wrapped and tied so that its length reaches the infant's dorsum pedis (instep). If it is too short, cold pathogenic factors will invade, causing disharmony in the abdomen and frequent dysentery. If the cord is severed before bathing, water may enter the umbilicus; water entering the umbilicus can induce abdominal pain. After the cord is severed, there are often worms within the connected cord tissue, which should be promptly removed and cleared out; otherwise, they may enter the infant's abdomen and cause disease. The umbilical cord should be left at a length of six cun. If too long, it damages the muscles; if too short, it injures the internal organs. Failure to sever the cord in a timely manner or incomplete drainage of umbilical fluid will cause the body's warm qi to gradually diminish, leading to the generation of cold pathogens and resulting in neonatal tetanus (Umbilical Wind). (*Qianjin Yifang* [Supplement to Essential Prescriptions], *Taiping Shenghui Fang* [Holy Benefit Formulas of the Taiping Era], and ancient texts regarding methods for severing and wrapping the umbilical cord all share similar descriptions.)
The *Yingtong Baojian* (Precious Mirror for Infants and Children) discusses umbilical cord severing in infants: Upon birth, an infant may first be bathed and then have the cord severed, or the cord may be bitten through using clothing as a cushion. Alternatively, scissors may be used. If scissors are employed, they should first be warmed in the bosom before use. Furthermore, the severed cord should not be left too long; its length should correspond roughly to the size of the infant's foot. If too short, cold invades and injures the viscera; if too long, it damages the skin. Severing the cord before washing allows water to enter the umbilicus, causing the child significant suffering, crying, and a cyanotic-black complexion, a condition known as "Water Affliction." If the cord is too short, abdominal disharmony and frequent dysentery occur due to cold invasion. The umbilical region must not be disturbed; disturbance leads to prolonged non-healing. Non-healing exposes the area to external wind pathogens, which can lead to trismus (lockjaw), rendering the infant incurable.
The *Miyao Zhimi* (Secret Essentials Pointing to the Mystery) states: When cutting off the umbilical cord of a newborn, ensure the scissors are warm. Avoid exposure to cold and invasion by external wind pathogens.
Zhuang Family Hereditary Scalding Umbilicus Pill Formula:
Fermented Soybean Paste (Douchi), Yellow Beeswax (Huangla) (each 1 fen), Musk (Shexiang) (a small amount).
Grind these ingredients together until soft and cooked, shape into pills. After severing the umbilical cord, place the pill on the umbilicus and moxibustion is applied for three moxa cones (zhuang), with each cone sized like a wheat grain. If the infant does not cry, apply five to seven cones. After moxibustion, seal the umbilicus with the Umbilicus Sealing Powder (Fengqi San). Keep the area dry to prevent umbilical swelling. (The formula for Umbilicus Sealing Powder is found in the section on Wrapping the Umbilicus.)