Baby Nathalie is trying a new food. Her facial expression shows a distinct, archlike mouth opening. Based on her reaction, Nathalie probably finds that the food tastes

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The archlike mouth opening is a typical response to a bitter taste. Babies have an innate tendency to reject bitter tastes, as these are often associated with potentially harmful substances in nature. Sweet tastes, on the other hand, are usually met with a smile and an opened mouth. Salty and sour tastes, although not necessarily pleasant, do not usually elicit such a distinct facial expression.

Baby Nathalie Is Trying a New Food