Kissing a baby on the face generally does not cause serious adverse consequences; however, if the baby’s skin is broken or if the baby is kissed mouth-to-mouth, diseases may be transmitted. When the baby’s skin and mucous membranes are not broken, kissing the baby’s face generally will not cause infections and other negative consequences, because the role of the skin acts as a natural barrier to isolate the outside world of bacteria and microorganisms and so on. But when the baby’s face appears eczema, impetigo or other discomfort, the skin mucous membrane barrier is damaged, this time to kiss the baby’s face, some of the bacteria in our saliva, it is easy to infect the baby through saliva through the broken skin, so that the baby secondary skin infections. It is worth noting that you should never kiss your baby mouth-to-mouth, as it is very easy to transmit diseases, and many diseases are transmitted through saliva and other bodily fluids, such as Helicobacter pylori infection. There are many other ways to love and care for your baby, and elders should learn to express themselves scientifically to keep their babies away from harm.