[heartwood]

One possibility is that couples who are infertile may have naturally higher levels of epigenetic changes than the rest of the population, perhaps explaining the cause of their infertility.

Small study, 23 babies. Did they control for maternal age and health? What you'd really like to do is look at parents matched for age, health, and SES, and who ALL had difficulty conceiving - and compare IVF babies to those conceived after three years of trying, say.

[Mrs. Don-o]

Good point. I’d like to see a lot more information.