delivered the opinion of the court:
Defendant-appellant, Louis Carter, was charged by indictment with the offense of indecent liberties with a child. (Ill. Rev. Stat. 1979, ch. 38, par. 11 — 4(a)(1).) Carter was tried before a jury which found him guilty of the charge and the court sentenced him to 10 years of imprisonment. Defendant appeals from his conviction and sentencing, raising four issues. First, Carter contends that he was not proved guilty beyond a reasonable doubt because the testimony on which his conviction was based was not corroborated, nor otherwise clear and convincing. Second, Carter claims that the admission into evidence of testimony alleging a collateral crime was error because such testimony went only to appellant’s propensity to commit the crime charged. Third, appellant avers that admission of the testimony of the complaining witness, defendant’s stepdaughter, concerning her pregnancy and subsequent Caesarian delivery, constituted plain and reversible error. Fourth, defendant challenges his 10-year sentence as excessive. We affirm the decision of the trial court.
The charge against the defendant was based on his commission of an act of sexual intercourse with his 11-year-old stepdaughter during the latter part of May, 1979. At the time of the alleged incident the defendant was 35 years old.
Where a conviction for indecent liberties with a child is based on the victim’s testimony, and the defendant denies the charge, the testimony of the victim must be either corroborated, or otherwise clear and convincing to prove the defendant guilty beyond a reasonable doubt. (People v. Morgan (1977),
Appellant next contends that allowing the testimony of his natural daughter, Cherry, denied him a fair trial since her testimony alleged a collateral crime and did not bear on anything other than appellant’s propensity to commit the crime charged. Cherry testified that she engaged in several acts of sexual intercourse with the defendant. At trial, appellant failed to object to any of her testimony, hence he has waived any errors which result unless such errors fall within the ambit of the plain error rule. (People v. Carlson (1980),
Cherry’s testimony was also independently admissible since it was relevant for some other purpose than to demonstrate the accused’s propensity to commit an offense. (People v. Baptist (1979),
Appellant also assails Cherry’s testimony on the ground that its probative value was exceeded by its prejudicial effect. The determination of this issue is vested within the sound discretion of the trial court. The trial court instructed the jury that the evidence of other crimes was to be considered only for the limited purposes for which it was admitted, and not for appellant’s propensity to commit crime. In view of the limiting instruction and the similarities between the incidents, the trial court did not abuse its discretion in admitting the testimony. People v. Walters (1979),
The testimony of Detective Guyton is challenged by appellant as “unnecessary and prejudicial.” Appellant failed to object to her testimony at trial, and the issue is deemed waived on review. We also find that her testimony was not so prejudicial as to be within the plain error rule. (People v. Carlson (1980),
Appellant’s next assertion of error is that the State’s introduction of evidence that Brenda had become pregnant by her step-father, and that she had subsequently delivered by Caesarian section constitutes plain error on the part of the trial court. We disagree. The fact of the 12-year-old’s pregnancy establishes that a crime was committed. Where the birth of a child is within a natural gestation period dating from the alleged act of intercourse with the accused, the fact of birth is probative of the fact of intercourse, the approximate date of the intercourse and, because she testified that the defendant was her only sexual partner, the identity of the person with whom she had had intercourse. People v. Findley (1918),
The introduction of the Caesarian birth was not plain error. Plain error exists only where an alleged error, unobjected to at trial, is “so great that it would reasonably appear that the jurors had been influenced or prejudiced to the extent that they could not be fair or impartial.” (People v. Carlson (1980),
Appellant’s final contention is that his 10-year sentence of imprisonment for indecent liberties with a child is excessive. We observe initially that appellate review of sentencing is limited to whether the trial court abused its discretion. (People v. Perruquet (1977),
We affirm the judgment of the circuit court of St. Clair County.
Affirmed.
