pre kiss feeding act food purpose physically breaking order feed incapable food mother relatives baby produce baby food capable consumed child process food form transferred mouth individual directly mouth mouth hands cooked processed prior feeding behaviour common human history societies observed non human animals common present day western societies commonly practiced traditional cultures health benefits actively studied practice appears certain benefits infant provided good health infected roots mouth mouth feeding humans evolved food parent offspring male female courtship feeding observed numerous mammals animals species instance food begging behaviour observed young wolves wild dogs certain species involves young approaching mouth adult mouths adult portions food feed young aforementioned animals behaviour types mouth mouth contact bonding courtship young food contact accordingly feed mouth mouth feeding food mouth mouth contact bonding observed great supports idea human kissing feeding foods directly indirectly mouth roots higher animals ancestral great human kiss precursor human cultures kiss feeding kissing mother infant observed kissing believed socially form feeding food high similarity execution kiss feeding human kisses french kiss tongue push food mother child child receiving mother food tongue movements simply food fact observations species cultures confirms act kissing likely evolved similar relationship based feeding history culture written records found practice likely extends prehistoric times non human ancestors instance medical mother instructed medical remedy child fifth century roman culture food common lack practice contributed infant mortality medieval europe fed assortment food bread attitudes western medicine 1940s 1950s native american cultures societies strongly concerns practice lack knowledge prohibition missionaries doctors instead caused severe population resulted children deprived prevalent modern post industrial western societies offering foods found traditional cultures offers infant numerous benefits north_america commonly black hispanic mothers commonly women peoples human cultures act direct mouth mouth feeding linked showing affection known kiss feeding cultures act women remind children descendants obligations human cultures people fact use mouth mouth contact primarily feeding food sexual kissing observed arrival europeans form feeding believed evolved modern human acts kissing french kissing western societies strong compared similar criticisms previous generations similar rationale societies finding practice performed lower classes foreign cultures instance late 1800s medical community texas embroiled debate supporting practice arguing benefits stating health act commonly found human societies populations prevalent evolution selective advantage infant diet breast milk providing access micro nutrients disease transmitted pre foods benefits conferred risks practice evolution human behaviour furthermore prevention disease prove disastrous infant public health policy discouraged late 1980s early 1990s end potential benefits practice greatly depend medical circumstances mother child true scope benefits societies active research appears consensus benefits practice advantages supplement health practices young children providing large amounts protein nutrients available breast milk iron essential nutrients present mainly meat compounds help increase availability protecting stomach acid infant intake iron beef likely human evolution hunter animal derived iron source shown benefits young children years onwards improving growth motor functions earlier times important practice prevented infant iron provide iron easily absorbed human physiology higher non sources recommended sources iron anti benefits infant benefit resistance anti growth factors nutrient mother related hypothesis early childhood exposure rich important immune system reducing responses promote development infant immune systems generators mother help prevent development infant early infant feeding foods eggs nuts alongside help promote immune tolerance help moderate responses practice play important role development oral help prevent occurrence diseases infant rise diseases western societies directly linked decrease societies researchers believe phenomena related parental foods allow better infant presence lacking alpha maternal aids fed baby important developed nations milk containing frequently introduced feeds early stage require action children fed mainly plant based vegetarian parents benefit prevalent different types digestive food fat adult help infant fat absorption generally produce digestive tracts efficiently process consume transmission diseases transmit wide range diseases infected parents parents open mouth including hiv aids possibly virus given prevalence hiv populations lower income poorer nation states practice extensively practice likely important method transmission virus populations chile practice associated hiv transmission unaware infection children care state mothers west know carrying hiv infectious agents mothers exercising caution wish children experts use science justify personal disapproval establishment cavity causing bacteria widespread belief dental causing bacteria mother oral ecology transmitted infant resulting colonization strong tooth decay child study instead found children develop higher resistance frequent mother infant contacts
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