%mlink(STRY:; PHOTO:; AUDIO:%)

PHILADELPHIA (AP) _ A medical resident who put cocaine in a baby bottle to quiet a 4-month-old boy was convicted Wednesday of third-degree murder in the infant's overdose death.

Prosecutors said Donald P. Ford, 43, was doing drugs with Andrea Blue, the baby's mother. Blue, a 39-year-old former nurse supervisor, was acquitted of the murder charge but convicted of lesser charges including reckless endangerment.

Assistant District Attorney Gail Fairman said Ford put cocaine in the bottle of Sigmund Porter Jr. to keep him quiet so Ford could sleep.

``He was trying to keep the baby quiet ... and he put too much in,'' Fairman said Wednesday.

Ford could be sentenced to 20 to 40 years on the murder charge. Blue faces up to nine years in prison. Sentencing was set for July 24.

Ford, a native of Narragansett, R.I., was a former psychiatry resident at the University of Pennsylvania.

His lawyer, A. Charles Peruto Sr., had argued that his client was a drug addict, not a murderer.

Fairman said Ford and Blue had met just days before the child's death on March 27, 1997. She said Blue went to Ford's house several times over two days, and that she and Ford used cocaine, crack and Valium, and had sex.

Blue left the child with a baby sitter, but the sitter brought the baby to Ford's house so that Blue would not have to return home.

Blue said she woke up to find the baby not breathing and woke Ford. Ford's lawyer said he tried to resuscitate the child, but could not.