Peoria County Coroner Johnna Ingersoll says more testing is needed to determine a 5-month-old Peoria boy's cause of death.
Preliminary autopsy results for Benjamin Sargent are inconclusive, but did not show any trauma.
Sargent's father called 9-1-1 from their Proctor Street home on Tuesday.
When rescue personnel arrived around 3:00p.m., the baby was in his crib, seated in a car seat.
Ingersoll has said the baby had not been well cared for.