This is probably a custody/visitation situation. Notice that there is no mention of the mother, either in the home or elsewhere. Given that the father is only 19, it is very likely he was ever married to the mother. And notice that the baby was discovered by an unnamed "family acquaintance."
Dad is identified as ERIC JOSEPH-KAREEM WILLIAMS.
http://www.abcactionnews.com/news/region-south-pinellas/st-petersburg/pd-st-petersburg-baby-abused-by-father-left-with-severe-brain-trauma
PD: St. Petersburg baby abused by father, left with severe brain trauma
By: WFTS Webteam
Posted: 12:42 PM, Jul 14, 2015
St. Petersburg Police have arrested a father on charges of aggravated child abuse.
Detectives said Eric Joseph-Kareem Williams, 19, abused his 11-month-old son so severely it caused brain trauma that required emergency surgery.
The baby was found unresponsive at home on 17th Way South by a family acquaintance on July 12.
The baby was rushed to the hospital where doctors also found severe burns on his body and bruises on his chest and face.
Williams told investigators the injuries were the result of an accidental fall.
A doctor determined that injuries to the brain and body were inconsistent with William's explanation to detectives.
In addition to the child abuse charges, Williams is also facing charges for violation of probation for carrying a concealed firearm.
The child remains in critical condition at All Children's Hospital.