Number discrimination in 10-month-old infants

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Newborn infants perceive abstract numbers (2009, background): “Although the participants in the present study discriminated numbers robustly only when they differed by a ratio of 3:1, infants show reliable discrimination at ratios of 2:1 by 6 months of age, and 3:2 by 9 months of age (6, 19, 39), and older children and adults discriminate numbers at progressive”
The Routledge international handbook of dyscalculia and mathematical learning difficulties (2014, unknown): “…neonates) could discriminate between two numerosities presented in different modalities (i.e., visual and auditory) that differed by a ratio of 3:1; and could discriminate between numerosity ratios of 2:1 at 6 months (Xu & Spelke, 2000), and ratios of 3:2 at 10 months old, (Xu & Arriaga, 2007).”
Relationships between approximate number system acuity and early symbolic number abilities (2012, background): “While 6-month-olds can discriminate large sets of objects when the numerosities involved are sufficiently distant from each other (1:2 ratio, [54]), 9-month-olds are able to differentiate numerosities separated by a closer ratio (2:3 ratio, [24,53]).”