Sure, tons. A simple Google search turns up reams of sources (and articles about sources). A few random readings show studies on single-mother families having highest rates of poverty, increased rates of smoking, lower health, etc.

The fully explored answer to that is an article (or book) in and of itself, I can't cover every single outcome but highlight some prominent ones in a 2000 word article.

I was actually referring to the ProPublica article linked in the parent comment of mine. I believe it's much longer than yours so I was surprised it skipped such an alarming fact. I can certainly appreciate the tradeoffs of what to mention in only 2,000 words!