寸口脉沉迟冷吐，脉浮洪数者热吐，脉微细不语者难治。小儿乳后便呕吐，更兼脉乱无忧虑。
小儿呕吐，难以概举。有冷吐、热吐、积吐、伤乳吐。朱奉议以半夏、生姜为主，亦有食滞心肺之分，为
邪食不得下而反出者。郑氏云∶但吐不泻为逆吐，而有痰发惊者危，治之当断乳，但与稀粥
食。伤乳吐者，哺乳后即吐，此因乳食无度，脾气弱不能运化故也。譬如小器盛物，满则溢
，更当节乳。小儿吐乳身热，而吐乳成片，是胃热，积热恐生风。吐乳不化，夹清水，是胃
冷，必面青唇白者是也。食生冷或伤宿乳，不纳而出，宜温胃，去风寒，除宿冷，宜理中汤
、定吐饮。如诸药不效者，以参香饮治。冷吐者，冬月多有感冒风寒，由乳母感受寒气，承
寒便乳儿，冷气入儿胃中，呕吐喜热，恶寒，四肢凄清，寒吐必夹清涎吐出，以温中药，服
丁香丸、藿香正气散加丁香、四君子汤加丁香、橘红、干姜、炮生姜、枣去核同煎，食前服
。寒极者，理中汤加附子，炮去皮、尖、脐，量虚实治之。热吐者，面赤唇红，吐次少而出
多，乳片消而色黄，遍体热甚，或因暑气在胃，或食热物，精神不快而多烦躁，此热吐也。
宜去桂五苓散及香薷饮治之。又热吐即似惊吐，有黄涎夹乳食成片，头额温，五心热，小便
赤少，或干呕无物，夏、秋间多有此，五苓、二陈治之。
寸口脉象沉迟，伴有冷吐；脉象浮洪数，属于热吐；脉象微细且不能言语的，病情难治。小儿在哺乳后立即呕吐，如果同时脉象紊乱，则无需过度担忧。
小儿呕吐的症状繁多，难以一一列举。主要有冷吐、热吐、积滞吐、伤乳吐几种类型。朱奉议认为应以半夏、生姜为主药，但也存在食滞在心肺的区别，即邪气和食物无法下行反而上逆吐出。郑氏说：只呕吐不腹泻称为逆吐，如果伴有痰湿引发惊风则情况危急，治疗时应停止哺乳，仅给予稀粥食用。伤乳吐是指哺乳后随即呕吐，这是因为哺乳无节制，脾气虚弱无法运化所致。就像小容器盛物，满了就会溢出，更应当节制哺乳。小儿吐乳时身体发热，且吐出的乳汁成片状，这是胃热，积聚的热邪恐怕会引动肝风。吐出的乳汁不消化，夹杂清水，面色青、嘴唇白，这是胃寒的表现。因食用生冷或损伤了宿存的乳汁，导致食物不纳而吐出，适宜温补胃部，祛除风寒，消除宿冷，宜用理中汤、定吐饮。如果各种药物无效，可用参香饮治疗。冷吐者，冬季多有感冒风寒的情况，由于乳母感受寒气，带着寒气给婴儿哺乳，冷气进入婴儿胃中，导致呕吐喜热、恶寒、四肢清冷，寒性呕吐必然夹杂清稀涎沫吐出，应用温中药治疗，服用丁香丸、藿香正气散加丁香、四君子汤加丁香、橘红、干姜、炮制生姜、去核大枣同煎，饭前服用。寒气极重的，在理中汤中加入附子（炮制去皮、尖、脐），根据虚实程度进行治疗。热吐者，面红唇赤，呕吐次数少但吐出量大，乳汁片块消散且颜色发黄，全身发热严重，或因暑气蕴结在胃，或食用热性食物，精神不适且多烦躁，这就是热吐。适宜用去桂枝的五苓散及香薷饮治疗。另外，热吐有时类似惊吐，有黄涎夹杂乳食成片，头额温热，五心烦热，小便短赤，或干呕无物，夏秋季节多见此症，用五苓散、二陈汤治疗。
The pulse at the Cun Kou (Cun position of the radial artery) is deep and slow, indicating cold vomiting; the pulse is floating, large, and rapid, indicating heat vomiting; the pulse is minute and fine with aphasia indicates a difficult-to-treat condition. When infants vomit immediately after breastfeeding, if accompanied by a chaotic pulse, there is no need for excessive worry.
Infantile vomiting is diverse and difficult to enumerate comprehensively. It includes cold vomiting, heat vomiting, food stagnation vomiting, and milk-injury vomiting. Zhu Fengyi advocated using Banxia (Pinelliae Rhizoma) and Shengjiang (Zingiberis Rhizoma Recens) as main herbs, but also distinguished between food stagnation in the Heart-Lung region, where pathogenic factors and food fail to descend and instead regurgitate. Zheng stated: Vomiting without diarrhea is termed Ni Tu (Rebellious Vomiting); if accompanied by phlegm inducing fright convulsions, the prognosis is critical. Treatment should involve weaning and feeding only thin rice gruel. Milk-injury vomiting occurs when vomiting follows immediately after breastfeeding, caused by unregulated feeding and weak Spleen Qi failing to transform and transport. Just as a small vessel overflows when full, breastfeeding must be regulated. If an infant vomits milk with body heat and the vomitus appears in clumps, this indicates Stomach Heat; accumulated heat may generate Wind. If the vomited milk is undigested, mixed with clear fluid, and accompanied by a cyan face and white lips, this indicates Stomach Cold. Vomiting due to consuming raw/cold foods or damaging stored milk, resulting in failure to retain food, requires warming the Stomach, dispelling wind-cold, and eliminating old cold. Li Zhong Tang (Regulate the Middle Decoction) and Ding Tu Yin (Stop Vomiting Drink) are appropriate. If other medicines are ineffective, Shen Xiang Yin (Ginseng and Aquilaria Drink) should be used. In cases of cold vomiting, common in winter due to wind-cold invasion, the mother may have contracted cold and transmitted it through breastfeeding, allowing cold qi to enter the infant's Stomach. Symptoms include vomiting preferring warmth, aversion to cold, and cold limbs. Cold vomiting必然 involves vomiting clear saliva. Treatment involves warm middle-jiao herbs, such as Dingxiang Wan (Clove Pill), Huoxiang Zhengqi San (Agastache Powder to Rectify the Qi) added with Dingxiang (Caryophylli Flos), Sizijunzi Tang (Four Gentlemen Decoction) added with Dingxiang, Juhong (Citri Reticulatae Pericarpium), Ganjiang (Zingiberis Rhizoma), Paoshengjiang (Prepared Zingiberis Rhizoma), and Jujubae Fructus (with pits removed) decocted together, taken before meals. For extreme cold, Fuzi (Aconiti Lateralis Radix Praeparata) is added to Li Zhong Tang (prepared, peeled, tip and navel removed), dosed according to deficiency or excess. Heat vomiting presents with a red face and red lips, infrequent but voluminous vomiting, dissipated yellowish milk clumps, severe generalized heat, or heat accumulation in the Stomach from summerheat or consumption of hot-natured foods, leading to mental discomfort and irritability. This is heat vomiting. Wuling San (Five-Ingredient Powder with Poria) minus Guizhi (Cinnamomi Ramulus) and Xiangru Yin (Elsholtzia Drink) are indicated. Furthermore, heat vomiting may resemble fright vomiting, characterized by yellow phlegm mixed with milk-food clumps, warmth on the forehead, five-palm heat, scanty dark urine, or dry heaving without substance, commonly seen in summer and autumn. Wuling San and Erchen Tang (Two-Aged Decoction) are used for treatment.