SMITHFIELD -- Lynn Paddock's stepdaughter, Jessy Paddock, told jurors this morning that her stepmother wrapped her youngest son in blankets and shoved him under a bed in the attic the night before he died.

Lynn Paddock is on trial on a charge of first-degree murder in the death of Sean, 4, the youngest of six adoptive children. He suffocated after being bound so tightly in blankets he couldn't breathe.

A prosecutor played for jurors the 9-11 call that Jessy Paddock made the morning Sean died. In the courtroom, Lynn Paddock sobbed and turned her back to Jessy as she listened to the tape.

Jessy testified that Lynn had told her to call for help because something was wrong with Sean.

"We have a child that's not breathing," Jessy told a dispatcher. She told him that Sean was cool as the dispatcher coached her on instructing Paddock how to administer CPR.

Jessy said Paddock was calm but rushed as she tended to Sean. She changed him out of his nightshirt and tried to revive him with CPR, Jessy said.

A week before Sean died, Jessy testified, Paddock told her that she'd prayed to God for a solution to Sean's habit of roaming the family's farmhouse at night. The night before the death, Jessy said, Sean was wrapped in blankets and shoved under the metal frame of a bed upstairs in the attic.

Paddock had started wrapping his sister, Kayla, 5, in blankets several months before Sean's died, Jessy said. The morning Sean died, Jessy said, she had to unwrap Kayla.

"It was tight," she said.

Jessy, now 20, also testified that Lynn Paddock had been trying to get pregnant for months before Sean's death. Her attempts to become pregnant became an obsession for Lynn Paddock, Jessy said.

"That's all she could talk about to me," Jessy said.

She also told jurors that Lynn Paddock had grown more agitated over the years as more and more adoptive children were delivered to her home. Jessy lived with her stepmother from the time she was 2 years old.

The Children's Home Society, a private adoption agency, placed the six children with the Paddocks from 1996 to 2005. The state contracts with the Children's Home Society to find parents for children in foster care.

Jessy said that Lynn Paddock's discipline became more ruthless when Kayla arrived in 2003. She said she watched as Kayla was whipped with a plastic plumbing supply line and dragged by a rope across a field where hogs grazed.

Once, she said, she saw Lynn Paddock pull Kayla's dress over her head and beat her back. Kayla's back "was covered in stripes of bruises," from her shoulders to the small of her back, Jessy said.

"There was little unbruised flesh on that portion of her back," Jessy said.

Prosecutor Paul Jackson showed jurors two pieces of the plastic plumbing supply line, which Jessy said Paddock used to "spank" the children.

He then pulled out photos of Sean's back taken at the hospital the morning he died. Reddish welts covered his backside, from his shoulders to his buttocks. Jessy said the plumbing supply line caused those marks.