Investigators say a 21-month-old boy died of a morphine overdose and had amphetamines, opiates and meth in his urine.
13-year-old son weighed just 21 pounds when he died in January.
Legislation passed by the Missouri House would give social workers more time to complete investigations into child abuse and neglect.
Beloit police arrested a mother after two young children were found alone in a cold vehicle in a Wal-Mart parking lot.
The Child Care Association projects 21,720 abuse cases in the current fiscal year, 2012, which ends June 30.
St. Charles County spokesman John Sonderegger says detectives knew there was something terrible in the home as they approached it.
A Granite City couple faces child neglect charges