Level 1: Causes of baby\’s loss of appetite There may be many reasons for baby\’s loss of appetite, such as illness, tooth eruption, environmental changes, anorexia, etc. If the child has symptoms such as fever and vomiting, it may be a loss of appetite caused by illness; if the child is teething, it will also affect their eating; and changes in the environment, such as moving or going to kindergarten, will also