First, I would recommend getting rid of this ridiculous debt, or remember this day and this answer, "you will be living this way for many years to come and maybe worse, no/not enough retirement". Hold off on any retirement savings right now so that the money can be used to crush this debt.
Without knowing all of your specifics (health insurance deductions, etc.) and without any retirement contribution, given $190,000 you should probably be taking home around $12,000 per month total. Assuming a $2,000 mortgage payment (30 year term), that is $10,000 left per month.
If you were serious about paying this off, you could easily live off of $3,000 per month (probably less) and have $7,000 left to throw at the student loan debt. This assumes that you haven't financed automobiles, especially expensive ones or have other significant debt payments. That's around 3 years until the entire $300,000 is paid!
I have personally used and endorse the snowball method (pay off smallest to largest regardless of interest rate), though I did adjust it slightly to pay off some debts first that had a very high monthly payment so that I would then have this large payment to throw at the next debt.
After the debt is gone, you now have the extra $7,000 per month (probably more if you get raises, bonuses etc.) to enjoy and start saving for retirement and kid's college. You may have 20-25 years to save for retirement; at $4,000 per month that's $1 million in just savings, not including the growth (with moderate growth this could easily double or more). You'll also have about 14 years to save for college for this one kid; at $1,500 per month that's $250,000 (not including investment growth). This is probably overkill for one kid, so adjust accordingly. Then there's at least $1,500 per month left to pay off the mortgage in less than half the time of the original term!
So in this scenario, conservatively you might have:
- No student loan debt in 3 years.
- No mortgage debt and an extra $3,500 per month in 10 years.
- Over $300,000 for college in 14 years.
- Over $2 million for retirement in 20 years.
Obviously I don't know your financials or circumstances, so build a good budget and play with the numbers. If you sacrifice for a short time you'll be way better off, trust me from experience.
As a side note: Assuming the loan debt is 50/50 you and your husband, you made a good investment and he made a poor one. Unless he is a public defender or charity attorney, why is he making $60,000 when you are both attorneys and both have huge student loan debt? If it were me, I would consider a job change. At least until the debt was cleaned up. If he can make $100,000 to $130,000 or more, then your debt may be gone in under 2 years! Then he can go back to the charity gig.