Korey Brown was found unresponsive in a playpen at the day care home when his mother went to pick him up. The mother said she noticed bites and bruises on his face, and she called 911.
After an investigation, police said the boy was crying and another child at the day care, an 8-year-old girl, tried to help but ended up causing the baby's death.
Collins was never accused of directly injuring Korey, but she also pleaded guilty to a state licensing violation which requires her to be awake while caring for children and her home day care.
Collins is scheduled to be back in court next month for sentencing.