To determine whether the baby’s navel has pus, mainly based on the navel surface whether there is redness, swelling and pus and whether the blood is increased, the bacterial culture of secretions, etc. to determine. 1. Whether the surface of the navel is red, swollen and pus-flowing: after the baby is born, the navel will slowly scab. However, if the surface of the baby’s navel is red and swollen, and yellow pus flows out, even with a fishy odor, this situation is considered that the baby’s navel has pus. 2. whether the blood increased, secretion bacterial culture: baby if the navel has pus, then because of the impact of local inflammation may lead to increased white blood cells. At this time, blood test will suggest that the blood is high. Secretion bacterial culture will suggest the culture of pathogenic bacteria. In daily life, parents should pay attention to the care of the baby’s navel, to pay attention to observe the changes of the baby’s navel, and regularly disinfect every day. If the baby’s navel appears to have redness, swelling and pus, take the child to the hospital as soon as possible.