Physiologic or pathologic causes may be present in infants who are too often trying to hold their strength. 1. Physiologic causes: Physiologic causes include overdressing, uncomfortable clothing, hunger or overfeeding, and grunting or excessive straining when the child wants to urinate or defecate. 2. Pathological causes: There are more pathological causes, such as whether the child has abdominal pain, fever, gastrointestinal tract dysfunction, and so on. When the baby has the above mentioned uncomfortable problems, he/she may have the problem of crying with exertion, and there is a deficiency of calcium and other nutrients, which may also occur due to the baby’s excessive nervous excitability. If you find that your baby has excessive symptoms of energy saving, it is necessary to consult a pediatrician in a regular hospital to find out the cause.