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Tang Shuo: Breastfeeding and feeding infants must be done with proper method. "Ru" (Breast milk) refers to breast milk, and "Bu" (Complementary food) refers to solid food. After breastfeeding, one must not immediately give solid food; after giving solid food, one must not immediately breastfeed. Because the spleen and stomach of infants are weak, if milk and food enter the body simultaneously, they are difficult to digest. By the age of one year, this will inevitably lead to "Ru Pi" (accumulation due to milk stagnation) and "Shi Pi" (accumulation due to food stagnation), causing pain and heat in the abdomen. The disease of "Gan" (infantile malnutrition syndrome) originates from such causes.

Danxi stated: When blood and qi are abundant, food is easily digested, so there is no fixed time for eating. However, the intestines and stomach are still fragile and narrow. Foods that are thick, sticky, dry, hard, sour, salty, sweet, or spicy, as well as all meat, fish, fruits, wet noodles, roasted, baked, simmered, or fried foods, are items that generate heat and are difficult to digest; these should be strictly prohibited. Only provide cooked vegetables and plain white porridge. This not only prevents illness but also avoids indulging the mouth, thereby cultivating virtue. Additionally, raw chestnuts are salty in flavor, and dried persimmons are cool in nature, which can assist in nourishing yin. However, chestnuts are too tonifying, and persimmons are too astringent; both are difficult to digest and should be given sparingly. Some women, lacking knowledge, only indulge and spoil their children, fearing their crying, giving them anything they want. This accumulates into chronic diseases, making regret futile. Therefore, those raised in luxury and spoiled often suffer from illnesses in childhood. Upon reaching adulthood, their bones and sinews remain weak; when food is available, they cannot restrict their diet to maintain health, and during mourning, they cannot eat vegetarian food to fulfill ritual propriety. Neglecting minor details leads to a deficit in major principles. Can one not be cautious?

As for the wet nurse, she must be particularly disciplined. Once food is swallowed, the milk flow becomes smooth; when emotional desires arise, the milk meridians respond. If pathogenic factors reach the breasts, the milk will become stagnant. If an infant consumes such milk, disease will manifest immediately: either vomiting or diarrhea, sores or fever, aphthous stomatitis (mouth ulcers), convulsions, night crying, or abdominal pain. At the onset of illness, the infant's urine output will likely be low. One must inquire carefully and treat the mother according to her symptoms. If the mother is well, the child will be well; this requires foresight before symptoms appear.

The blood and qi of the wet nurse constitute the breast milk. The five emotions (joy, anger, worry, thought, fear) are generated by blood and qi. Therefore, the wet nurse should avoid excessive joy and anger and observe all taboos. Women suffering from bromhidrosis (fox odor), goiter (thyroid enlargement), or qi-related coughs, as well as those with scabies, tinea capitis (scalp ringworm), alopecia (hair loss), tight lips, deafness, hoarseness, nasal obstruction, or epilepsy, are unfit to nurse. During the intense heat of summer, after a wet nurse bathes, or if the infant is crying, do not breastfeed immediately, as this may cause "stomach toxin" in the child, leading to dysentery (red and white diarrhea) in autumn. After bathing, allow the wet nurse to calm her breathing for a while until the heat and dryness subside before breastfeeding, thus avoiding harm. Nie stated: Do not feed milk while the infant is crying violently, as this may cause qi reversal and accumulation, potentially leading to wind-stroke (convulsions). The *Qianjin Fang* states: Infants should not be overfed; overfeeding leads to regurgitation and vomiting. If the milk flow is too forceful, express some out first, wait for it to settle, then breastfeed. Before nursing, the mother should squeeze out any retained hot milk. If the wet nurse wishes to sleep, she should prop herself up with her arm so that the nipple is level with the infant's head. As the mother feels drowsy, remove the nipple to prevent the infant from overeating and vomiting. If parents engage in intercourse while the infant sleeps nearby, or if the infant startles awake, do not breastfeed. The qi is chaotic and unsettled, which could be fatal to the infant. Chao Yuanfang stated: If an infant has not stopped crying and breath is irregular, the mother should not breastfeed, lest the milk fail to descend and stagnate in the chest and diaphragm, causing vomiting. The *Lunxin Jing* states: In summer, failing to eliminate hot milk causes vomiting; in winter, failing to eliminate cold milk causes diarrhea and subsequent dysentery. Caution is essential. For nighttime feeding, the mother should sit up and hold the infant while nursing. Every morning before the first feed, the mother must squeeze out retained old milk. Do not spill milk on the ground; if insects or ants consume it, it is believed to reduce milk production. It is better to pour it onto the eastern wall.