Analysis: 32 years of U.S. filicide arrests
https://news.brown.edu/articles/2014/02/filicide
Among offenders, while fathers were about equally likely to kill an infant, they were more likely to be the alleged murderer of children older than a year, especially when the children were adults (fathers were the offenders in 78.3 percent of those cases). Overall, fathers were the accused murderer 57.4 percent of the time.
The data allowed the researchers to determine the most common filicide scenarios. A father killing a son was the most likely (29.5 percent of cases), a mother killing a son (22.1 percent) follows. A mother was slightly more likely to kill a daughter (19.7 percent of cases) than a father was (18.1 percent). The rarest instances were stepmothers killing either a stepson (0.5 percent) or a stepdaughter (0.3 percent).
New study compares mothers, fathers who kill their children
https://www.sciencedaily.com/releases/2015/10/151028123953.htm
More males than females were accused nationwide, a difference that appears to be increasing.
Female accused were more common among people under 18, and males dominated in older age groups.
Women made up four out of five accused who were single and never married, and men represented two-thirds of accused who were divorced, separated or widowed.
More men than women were accused when revenge or jealousy was the motive.
Most accused were biological parents. When stepchildren were killed, nine of 10 accused were stepfathers. While numbers remain small, the proportion of accused who were step-parents, and particularly stepfathers, appears to be increasing.
Since 1991, more reports of family violence have occurred before filicides.
Fathers are more likely than mothers to commit suicide after killing a child, although the likelihood of either parent committing suicide has decreased in recent years.