Occasionally a child is born with teeth. Teeth can also erupt early -- within the first 30 days of life. These are called natal teeth and neonatal teeth, respectively.

(偶爾小孩在出生的時候就會出現牙齒,在出生的生命開始的前30天內萌發出來,這種情形統稱為新生兒牙)

Most commonly, there are only one or two natal/neonatal teeth in the lower anterior area, although more can be present in other areas of the mouth. The presence of natal or neonatal teeth in the posterior region is not common and may be associated with systemic conditions or syndromes.

(一般的情況是,會在下顎前牙區看到1或2顆的新生兒牙,雖然有的也會出現在口腔中的其它地方,但出現在後牙區的情況較罕見,可能的情況是與系統性疾病或徵候群一起出現Jadassohn-Lewandowsky-syndrome, Ellis-van Creveld syndrome, Hallermann-Streiff syndrome)

These teeth are usually the normal primary incisor teeth erupting early. Due to this early eruption, the tooth will not be fully developed. While the majority of the crown will be formed, the root structure is not normally present; therefore, a natal or neonatal tooth will be mobile.

(這些早期萌出的牙齒通常會像乳切牙一樣的萌出,由於這樣早期的萌出,牙齒的發育並不是很完好,因此,新生兒牙基本上是浮動的)

If the mobility is not too severe, the tooth may become firm on its own and can be left alone. Excessive mobility may lead to exfoliation of the tooth, as in your daughter's case. If the tooth is excessively mobile and has not exfoliated, parents should consider having the tooth extracted to avoid aspiration or ingestion of the tooth. If the tooth is extracted, care needs to be exercised to extract the entire tooth.

(假若搖動度不是挺嚴重的,這種牙齒會穩固的存在於原地,大的搖動度會導致牙齒的脫落,如同您女兒的那種情況,假使牙齒是大的搖動度,但沒有脫落,家長必須思考將牙齒拔掉,以避免牙齒被吸入或是吞入,假使牙齒被拔掉,必須小心注意要整顆都拔除)

If only the crown is extracted with pulpal tissue (nerve and blood vessels present in the tooth) left behind, dentin (the layer of tooth structure underneath the enamel) and root structure may subsequently form. If this occurs, root removal may be required in the future.

(一旦牙冠部被拔除並帶有牙髓(含有神經與血管在中),象牙質和牙根的結構順利的形成,如果這樣的情況發生,牙根的移除在未來是必要的)

Because natal and neonatal teeth are usually normal primary teeth, a new primary tooth will not replace them once they are lost. In the anterior region of the mouth, this premature loss of the primary tooth does not typically result in problems with the permanent teeth. In the posterior region, maintenance of space for the permanent teeth to erupt normally should be considered

(因為新生兒牙通常是屬於正常的乳牙,假若正常的乳牙不存在的話,是沒法來替代的,在口腔中的前牙區,這樣的先期掉乳牙並不見得會導致產生恆牙的問題,在後牙地段,恆牙萌出空間的保持必須妥善的考慮)

以下的paper(文獻)可以來說明新生兒牙的情況