Enlarged lymph nodes in the armpits of babies are usually considered to be caused by infections, such as lymphatic tuberculosis or lymphadenitis, or even lymphoma and other diseases. If there is no obvious abnormality on the surface of the swollen lymph nodes in baby’s armpits, and they are hard to the touch, have good mobility, no pressure or tenderness, and usually have no symptoms of night sweating (sweating abnormally after going to sleep, but sweating stops after waking up) or fever, it is mostly considered that it may be caused by bacterial infection. If the growth rate is faster, and the effect of antibiotic treatment is poor, then you need to go to the hospital as soon as possible for lymph node biopsy section examination, to clarify the nature of the disease, to exclude Hodgkin’s lymphoma and non-Hodgkin’s lymphoma, as well as leukemia and other diseases may be.