That is rough. I just graduated, so I am insulated from this change if it is systemic. It does look like unsubsidized insurance at my school has gone up by about that much. The department covered 85 or 90% for me though, so the cost was a little easier to bear.
If you are relying on student health insurance, then I assume that you are the only one working and your spouse is staying home. It is likely that you qualify for some form of medicaid. It is pretty easy to get kids under 5 covered, which would leave you to purchase insurance for you and your spouse. The laws vary by state, so it is something that you would have to look into yourself. Try asking current students that have kids, they should have better details. Also, you get different answers from the benefits office depending on who you talk to. I know that someone in my program didn't have any of his income counted for medicaid purposes because they called it all "scholarship income" but my stipend was partially considered to be a scholarship.
I was reluctant to rely on government programs at first, but it dramatically increased quality of life for me and my family during the program.