嬰兒從出生的那一刻起，其哭聲即代表著個體的差異性及與生俱來的傾向，也被人們稱為行為風格或是氣質。目前評估氣質的方法，都由照顧者填答問卷的方式，在本文中為了能夠早期預測嬰兒氣質，提出了藉由B型肝炎疫苗的痛覺刺激所產生的哭聲，配合家長填寫的氣質量表及問卷，結合後端的哭聲訊號進行分析的方法。實驗結果顯示，不同居家環境的嬰兒反應強度有顯著差異(p≦0.01)，家中環境比較吵雜的人，在反應強度上，是比較激烈的。哺乳狀態與嬰兒規律性是有顯著性(p = 0.046)，喝純母乳的嬰兒，會比較有規律性。安撫秒數與堅持度有顯著性(p = 0.029)，堅持度越低的，安撫秒數越久。在換氣速率與反應強度是有顯著性(p = 0.04)，當反應強度激烈，換氣速率就越高。哭聲類型與注意力分散度是有顯著性(p = 0.028)，在聲音漸小者，在注意力分散度難轉移，在聲音持續與漸大者，注意力分散度容易轉移，哭聲相似的族群其趨避性、反應強度與情緒本質的三項氣質項目的平均分數會比有較高的趨勢性，本文所提出痛覺刺激所產生的哭聲，可以用來預測嬰兒氣質中的趨避性、反應強度與情緒本質。

An infant is an individual who possesses his/her innate personality. For an infant, crying is a form of communication, an expression of emotions and temperament. Our study aims to predict an infant’s temperament in the early stage by analyzing the crying sound after painful stimulation of vaccination. According to this study's results, the intensity of infants’ reactions varied significantly with their home environments (p≦0.01). Infants from noisier home environments reacted more intensely. Besides, whether infants were breastfed was also significantly correlated. With the rhythmicity of their physiological cycle (p = 0.046). Breastfed infants indicated a higher level of rhythmicity. Also, the number of seconds taken by the parent to comfort the infant significantly correlated with the infant’s persistence (p = 0.029).
Moreover, the types of cries significantly correlated with infants’ distractibility (p = 0.028). Infants whose cries became softer were more difficult to distract. A tendency exists for a group of infants with similar and focused crying sounds to have higher average scores for three of nine temperament traits: approach or withdrawal, the intensity of reaction, and quality of mood. As far as the conclusion is concerned, an infant’s crying sounds in response to a pain stimulus can be used to predict their temperament in terms of the three aforementioned traits.

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