DALLAS (AP) _ An 18-year-old woman visiting her husband at work was shot to death by gunmen and fell on her 16-day-old daughter, almost smothering the baby, police said.

Sonja Aguilar, 18, whose husband, Louis, 21, was pistol-whipped by bandits who robbed the Southern Comfort Motel where he was manager, was pronounced dead at the scene, homicide Lt. Ron Waldrop said Thursday.

The couple's daughter, Desi Raie Marie Aguilar, was in critical condition early today at Methodist Medical Center, hospital spokesman Don Flaigg said. The baby, who was not breathing when police arrived, was revived at the scene by firefighters.

''It was one of the most brutal robbery-murders I've seen,'' Waldrop said. ''There was no provocation - and no explanation - why they started shooting. (Mrs. Aguilar) was sitting in the corner of the room holding her baby.''

Aguilar suffered lacerations on the back of his head and was treated and released from the hospital, Flaigg said.

He was overpowered by two men who had asked for towels and then forced their way into the motel office, police said. The two men apparently fled on foot and were still at large early today.

''It was senseless - and for $110,'' said Aguilar's cousin, Rudy Hernandez, co-owner of the motel. ''What a horrible way to spend Thanksgiving.''

The robbers may have killed Mrs. Aguilar because she had a better look at them than did her husband, said her father, Manuel Cervantes.

''She saw the people who did it - saw them knock Louis down,'' Cervantes said. ''When she started to run, they shot her in the back. She went down on top of the baby.''

It was the second robbery-slaying at a Dallas-area motel in as many weeks. On Nov. 16, gunmen fatally shot one clerk and wounded another at the Holiday Inn near Dallas-Fort Worth International Airport. Five people have been arrested in that case.

Police said they don't believe the two robberies are related.