Florida Man Arrested for Allegedly Pouring Meth into a Baby's Sippy Cup

A Florida man was arrested for allegedly pouring methamphetamine into a 1-year-old child's sippy cup ... and the child ingested the drugs, overdosed, and was taken to a hospital in critical condition ... law enforcement sources tell TMZ.

We're told the alleged incident went down in February, and doctors treated the child, who survived and was then placed in the custody of the Florida Department of Children and Families.

46-year-old Mark Windham was arrested Saturday and charged with child neglect causing great bodily harm and possession of drug paraphernalia with residue ... the Nassau County Sheriff's Office announced.