C.R.S. § 18-3.5-106

(1) A person commits the offense of unlawful termination of pregnancy in the fourth degree if the person recklessly causes the unlawful termination of the pregnancy of a woman at such time as the person knew or reasonably should have known that the woman was pregnant. (2) Intentionally left blank —Ed. (a) Unlawful termination of pregnancy in the fourth degree is a class 6 felony. (b) Unlawful termination of pregnancy in the fourth degree by any person is a class 5 felony if the pregnancy of the woman, other than a participant in the crime, is unlawfully terminated during the commission or attempted commission of or flight from the commission or attempted commission of murder, assault in the first or second degree, robbery, arson, burglary, escape, kidnapping in the first degree, sexual assault, sexual assault in the first or second degree as such offenses existed prior to July 1, 2000, or class 3 felony sexual assault on a child, but only to the extent that the person is a principal in the criminal act or attempted criminal act, as described in section 18-1-603 .