 
      Does our immune system change throughout life?
At birth, a baby's immunity relies upon antibodies and gut flora passed from their mothers. Over time the new baby builds up his or her own immune ...
At birth, a baby's immunity relies upon antibodies and gut flora passed ...
 
                         
                         
                         
                 
                 
                 
                 
                 
                 
                 
                 
             
             
             
     
         
       
         
         
         
         
       
       
       
       
      