Neonatal weakness in suckling refers to the fact that the newborn baby eats significantly less milk, seems to be unaware of hunger, has a short and weak sucking time, and tends to choke on milk when eating. Chinese medicine believes that the main factor of this disease is that children are mostly congenitally endowed with insufficient Qi and blood, and the Yang is not invigorated, followed by improper postnatal care and feeling cold, so the disease has a high incidence in the cold season in the north. Western medicine believes that the pathogenesis of this disease is not fully understood and can be caused by cold, premature birth, infection and asphyxia. The following diseases can also lead to weakness and reduction of suckling in newborns: 1. Neonatal vomiting Vomiting is one of the common symptoms in the neonatal period. Any stimulation of the soft palate, pharyngeal wall, gastrointestinal, and certain diseases of the nervous system itself (encephalitis, meningitis, etc.) are stimulated by the nerves to the vomiting center, which is a complex series of neuroreflex activities. The center sends out a response, causing the esophagus, stomach or intestines to move from the bottom up, while the diaphragm and abdominal muscles contract to force the food in the stomach to gush out of the mouth, which is the vomiting action. 2, preterm delivery Preterm delivery refers to the delivery between 28 weeks and less than 37 weeks of gestation. The newborn babies delivered at this time are called preterm babies, weighing 1000-2499 g. Preterm birth accounts for 5%-15% of all deliveries in China. About 15% of premature babies die in the neonatal period. In recent years, due to the progress in treatment and monitoring of preterm infants, their survival rate has improved significantly and their disability rate has decreased. Foreign scholars suggest advancing the upper limit of preterm birth definition to 20 weeks of gestation. 3, neonatal hemorrhagic disease Neonatal hemorrhagic disease, that is, neonatal vitamin K deficiency hemorrhagic disease, is a more common hemorrhagic disease in newborns. It is also known as neonatal natural hemorrhage, and its onset is due to vitamin K deficiency in the body, resulting in a hemorrhagic disease caused by low activity of vitamin K-dependent coagulation factors, including II, VII, IX and X. 4.Pediatric congenital hypothyroidism Congenital hypothyroidism (congenital hypothyroidism) is caused by congenital factors that impair the synthesis and secretion of thyroid hormones, resulting in growth disorders and intellectual backwardness in children. Congenital hypothyroidism is one of the most common endocrine diseases in pediatrics. 5, pediatric myasthenia gravis Myasthenia gravis (MG) is a chronic disease with dysfunction of transmitter transmission between neuromuscular junction. It is now clear that the onset of myasthenia gravis is the result of autoimmunity to postsynaptic acetylcholine (Ach) receptors. Myasthenia gravis is an autoimmune disease with dysfunctional transmission between the nerve-muscle junctions (synapses). It mainly involves acetylcholine receptors (AchR) on the postsynaptic membrane at the neuromuscular junction of the transverse muscles, but other parts of the body and tissues can also be involved. It is characterized by low muscle strength in the affected transverse muscles, easy fatigue, rapid decrease in muscle strength after repeated contractions in a short period of time, and a reduction in symptoms after rest, and is effective with cholinesterase medication.