This story is absolutely unbearable. I don't know the details as I can't bring myself to click on the headlines.
To the question, though: I think there's a necessary prior question, about what male/female split of infanticide we would expect.
Should it be roughly 50/50, because that's the adult population? In that case, men are hugely overrepresented as child killers.
Should it be female-majority, in recognition of the fact that women statistically do more child-rearing than men, and therefore have greater opportunity and greater motive (in so far as being utterly at the end of your tether, or distressed by events elsewhere in your life/mind, are 'motives' for murdering a child)? In that case, men are even more overrepresented.
Should it be roughly in line with the perpetrators of other murders? I can't speak to this statistically (although I'm sure a quick Google will cover it), but it wouldn't surprise me if it broadly is aligned. Women murderers seem much less common, but certainly exist. Maybe 10% is about right.
3, 4, 5 high profile cases don't yet make a statistical trend - even aside from the 'man bites dog' element of news reporting.