Thank you for your inquiry. From what we gather from the question, you were asking about the risk of a toddler acquiring HIV from eating food that had been pre-chewed by a caregiver. From the information given, this scenario is determined to be Low Risk (evidence of transmission occurs through these activities when certain conditions are met).
The scenario mentioned above could meet the three components of the transmission equation. If the pre-chewed food had blood containing the HIV virus, then transmission could occur, and has been reported to occur (1). This is why the CDC recommends that caregivers living with HIV should not pre-chew food for HIV-uninfected children, due to the possibility of transmission (2)
Recommendation: If a child has consumed food pre-chewed by someone living with HIV, refer to a health care provider for HIV testing. For other health related questions or more personalized answers please refer to a healthcare professional.
AIDS Vancouver Helpline/Online, Marie
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1) Practice of feeding premasticated food to infants: a potential risk factor for HIV transmission.
2) Premastication of Food by Caregivers of HIV-Exposed Children --- Nine U.S. Sites, 2009--2010