It's probably the case, but it's very difficult to find the stats. I am looking for them right now. There are a lot of problems. One is that infanticide often masks as SIDS (sudden infant death syndrome). Some say 5% of SIDS deaths are actually murders by the mother; others say it is much higher. I don't think anybody knows. Also, infanticide is often not prosecuted or is not counted as murder at all, so it depends on what is being counted as murder in any particular study. In my preliminary research, I have found so many different figures, and I've found it very difficult to determine the raw data: how many children were killed by their mothers in 2019 in the United States, for example. So I go with the lower figures, but I suspect it is much higher.