A Sydney court heard accusations that the athlete had the birth induced after telling hospital staff the child was overdue.
Dr Gregory Jenkins, who was on duty around the time Tegan was born, says the birth was induced after Lane told them the baby was overdue.
He said Lane told hospital staff she had booked a midwife for a home birth, but they were unable to contact the midwife on the number she gave them.
The doctor said hospital records show no family or friends were present for Tegan's birth.
Ms Lane said she was determined to represent Australia in water polo.
But she is also "on trial" for doing what so many us were told was a loving thing...
Just as in many murder cases, people's pasts - their infidelities and such are brought into the case to indicate their character - previous abortions and relinquishments before and after this child dies are being brought up in her court case...
The NSW Supreme Court heard yesterday that Ms Lane, who has pleaded not guilty to murdering her second child, Tegan, was "teary and upset" after giving birth to a baby in 1995 -- the year before Tegan was born.
"She was uncertain if she wanted to parent her baby that she had just delivered," social worker Deborah McCauley told a jury yesterday. "I remember she said . . . she had certain goals that she wanted to achieve.
"She told me that she was a champion water polo player and that her ambition was to compete in the Sydney Olympics and she did not feel in a position to parent a child."
The court heard yesterday that Ms Lane gave birth in 1995 to her first live baby after terminating two pregnancies during the previous three years, one at 20 weeks' gestation.
Prosecutors have alleged Ms Lane hid five pregnancies over seven years from her family, friends and lovers, spinning a complex web of lies surrounding each pregnancy.
Ms Lane has also pleaded not guilty to three perjury charges.
The court heard yesterday that Ms Lane rushed to a Sydney hospital in 1995 when she was 39 weeks' pregnant after her waters broke.
Prosecutors allege that on the night of the birth Ms Lane had earlier been socialising with friends -- who had no idea she was pregnant -- at a Balmain pub.
After the baby's birth, Ms Lane breast-fed and cared for the child for several days before relinquishing the baby for adoption.
Just a day after giving birth, Ms Lane requested a "gate pass" from the hospital, ostensibly to meet the baby's father to discuss adoption plans, the court heard.
Ms Lane left the hospital at 3.10pm the day after giving birth, and did not return until 6.20am the following day, leaving the baby in the care of nurses.
Prosecutors have alleged she did not meet the baby's father, but instead -- intent on keeping up the ruse of living a normal life -- attended a planned celebration for her own birthday.
The crown contends Ms Lane found the adoption process for her first child so traumatic that, when Tegan was born the following year, she did not want to go through it again, and instead chose to kill the baby and dispose of the body.
Judge Anthony Whealy issued a direction to the jury yesterday, urging them to keep an open mind and cautioning that the fact Ms Lane may have told lies about her pregnancies did not necessarily mean she had murdered Tegan.
"People can lie about one thing but be very truthful about other matters," Justice Whealy said.
"You must not fall into the error of thinking that if a person has told a lie, then that lie in itself can prove guilt -- it cannot."
It is also true that placing a child fro adoption and committing murder are totally different things.
The trial continues.