Maternal early life factors associated with hormone levels and the risk of having a child with an autism spectrum disorder in the nurses health study II.

The team looked at 116,000 female nurses in the Nurses’ Health Study II. They asked each woman when her periods started and what she weighed at age 18. Years later they checked which nurses had a child diagnosed with autism.

The goal was simple: see if a mother’s own early body timing linked to later autism risk in her kids.

Girls who got their first period at age 10 or younger had about 30 % higher odds of later having a child with ASD. Women who were obese at 18 (BMI 30+) showed a similar bump in risk.

Most other reproductive facts—birth order, age at first birth, irregular cycles—made no difference. Only those two early-life traits mattered.

Taylor et al. (2017) widens the lens. They show that stress during pregnancy, not just mom’s puberty timing, also shapes how severe autism looks. Together the papers say both pre-pregnancy biology and pregnancy events count.

Lalli et al. (1995) once measured actual testosterone in autistic boys and found nothing. Lyall et al. (2011) now step back in time and find a quieter hormonal signal—earlier puberty in moms. The older null result stays true for kids; the new hint lives in moms.

Kuenzel et al. (2021) flip the direction: after diagnosis, child behavior and money strain predict mom’s later depression. Kristen’s work shows the arrow can go the other way too—mom’s early body story may set the stage.

You can’t change when a client’s mom went through puberty, but you can use the info to sharpen family education. If mom shares she was an early bloomer or obese as a teen, flag any social or language delays in siblings even sooner. It also reminds us to ask about prenatal stress and current family strain—two other factors shown to matter.