________________________________________________________________
The American Academy of Family Physicians says most children stop sucking their thumb by the age of four. If it continues, the group advises parents to talk to their child's dentist or doctor. It could interfere with the correct development of permanent teeth.
美国家庭医生协会表示，多数孩子四岁时会停止吮吸拇指。如果孩子过了四岁还吮吸拇指，该协会建议家长向孩子的牙医或医生反应。这种行为可能会干扰恒牙的正常生长。
Dentists say children should have their first dental visit at least by the time they are one year old. They say babies should be examined when their first teeth appear -- usually at around six months.
牙医称，第一次带孩子看牙医，应最晚在孩子1岁时。婴儿长出第一颗牙齿时就应去检查，这通常是孩子6个月左右时。
