Because of the chemical nature of impulse and the axon-dendrite structure. Because of the chemical nature of impulse and the axon-dendrite structure. http://www.biologymad.com/nervoussystem/nerveimpulses.htm (Best technical explanation and excellent graphics and animations)
Newborns may sneeze, and this is typically attributed to the irritation of their nasal passages. The most common irritants, explains Dr. Iannelli, are smoke (and simply smoking outside is not enough), animal dander from pets in the house, dust mites, and mold.
3. Skin Rash. There are many causes for infant skin rashes like eczema. Milk allergy is one possible cause, especially if the rash occurs along with some of these other symptoms. 4. Extreme Fussiness. Every baby cries, but crying continuously and inconsolably for long periods of time is abnormal. When there is no apparent reason, this is usually called colic.