The taste-related behavior of twenty 18- to 23-month old children and twenty 24- to 29-month olds was recorded and used to investigate when children become capable of integrating their biological taste receptivity with linguistic speech. No significant sensitivity difference was apparent between the two groups for sweet and acidic solutions. The minimum taste-perceptible concentration of a salty solution was 2.5 times higher for 18- to 23-month olds than for 24- to 29-month olds. The 18 to 29-month olds demonstrated positive linguistic expressions for sweet and salty tastes, and negative expressions for acid tastes; however, their taste receptivity order was sweet, acid, and then salty. The 18- to 23-month olds showed greater receptivity to all three flavored solutions than the 24- to 29-month olds (p< 0.01). The taste sensitivity test showed that only the appearance ratio of spontaneous taste-related speech and the ratio of taste-matching speech content were significantly higher for sweet tastes in the 24- to 29-month olds than in the 18- to 23-month olds (p< 0.05). This result indicates that integration with spontaneous taste-related speech became possible at 24 – 29 months of age.