...or just being in the hospital environment for a month. The older theory they mentioned here:

> "The earliest twin studies really helped to debunk this theory that autism was caused by parenting," Morris says. Under this theory, moms took the brunt of the blame, supposedly for being "cold and distant and detached from their child."

...might not be entirely wrong. They've since shown genetics is a factor, and I'll ignore the institutionalized misogyny part, but being in a hospital for a month probably did mean having much less parent/care-giver interaction/touch during a critical period, and who knows how much of an effect that could have.