Plus, an adult's saliva can help predigest the food, making vitamins like B12 easier for the baby to absorb.So, mouth to mouth attachment has a history of intimacy, trust and closeness.
另外, 一个成年的唾液可以帮助预防消化食物,使婴儿更容易吸收多种维生素如B12。所以, 嘴对嘴的接触有亲近, 信任和亲密的历史。