Holmes is a serial liar and a sociopath who has not once shown remorse, admitted any guilt, taken responsibility, or held any accountability for anything she has done. She continues to use a fake voice and insists it is her real voice. Is it really that much of a stretch that at least part of the reason she had kids was to affect her verdict and then subsequent sentencing?
Also, I haven't seen it mentioned why she is only having to report by April, but I can only assume it is because she's pregnant.
When I read about Holmes in light of those posts, I'd say she is some sort of callous and insensitive person. She never once gave a shit about ethics, people's lives etc. Who knows she decided to have kids simply because it might reduce her sentence rather than because she really wanted to have kids like rest of us do.
I think it's unfair to draw attention to this particular decision that she has made as as callous or scheming when in reality there are already plenty of examples and her having children may have been the most human of them all.