Xu and Spelke's (2000) study as to whether infants have the abilities to represent numerosities found that:

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Xu and Spelke's (2000) study found that infants as young as 6 months old have the ability to represent numerosities. They observed that infants looked longer at displays that changed in numerosity compared to displays that only changed in perceptual qualities such as color or shape. This suggests that infants are able to discriminate between different quantities, indicating that they have a sense of numerosity.

Xu and Spelke's (2000) Study as to Whether Infants Have