What are the common illnesses in babies aged 4 to 6 months?

Common diseases in babies aged 4 to 6 months mainly include: 1. Respiratory system diseases: such as upper respiratory tract infections. Because the baby's immune system is not yet fully developed, it is susceptible to viral or bacterial infections, leading to symptoms such as colds and coughs. 2. Digestive system issues: such as diarrhea, especially common illnesses like autumn diarrhea. Babies have weaker intestinal function and are easily infected by viruses or bacteria. 3. Skin problems: such as eczema, a common skin condition that may be related to allergies, manifesting as skin itching and red rashes. 4. Oral infections: such as thrush. Babies' mouths are prone to infection by Candida albicans, resulting in white patches on the oral mucosa. For these common illnesses, parents should closely monitor their baby's physical condition and seek medical attention promptly.