The sitter, 41-year-old Tammy Denise Truitt of Carrollton, pleaded guilty on June 2 to aggravated battery.
Carrollton Police Lt. James Perry said Truitt was hired to babysit the infant, who was 9 months old, and his four siblings, aged 9, 7, 5 and 3, last July when the children's mother went to Atlanta for a family emergency.
Police said that when the children's grandmother arrived, she found the baby unresponsive. He was taken to a hospital, where tests revealed a blood-alcohol level of .33.
Doctors in Carrollton and Atlanta treated the infant before sending him home.