Need Advice-Should I quit my job?

I'm about three weeks from my due date and I am planning on taking 12 weeks off work. I'm really wanting to quit my job and stay home with my baby, but here is the dilemma.
I currently have medical, optical, and dental insurance through my work. It is pretty good insurance. My husband has his own medical insurance through his employer, but it is not very good coverage. He has no optical or dental. Medical deductible is very high. 
If I quit I'll have to get on his insurance. Is it worth it to lose my good insurance?
Also, I plan to breastfeed. There is no possible way to pump at work upon my return because I work alone from 9am-1pm every day. My co workers come in at 1pm and I work with them until 5pm. I could not lock myself in a room to pump and leave the bldg unattended. I don't want to only breastfeed for three months. 
Is it worth it to quit my job, lose my good insurance, to stay home with baby? Especially, so I can breastfeed. Is good health insurance worth not breastfeeding and not being home with baby? 
Thoughts?
Edit: The bldg I work in is open to the public, so there is no way I can hide in my office and not assist the public when they come in. 

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