It's against district policies to give a child anything without a parents' permission.
The 4-month-old is from a family that was vacationing in Minnesota.
The 9-month-old was found unresponsive in a crib.
Authorities in Crow Wing County are leading the investigation.
The 40-year-old's license was revoked for DWI in 2004.
His 5-week-old son's death was ruled a homicide.