Stitchfans, I am sure your DH is wonderful & loving. But he and you work together to control his illness, he takes his meds, he makes all the efforts necessary to keep his illness in check.
Doesn't sound like the OP's DH is doing that. I know that partof the illness is to think you are "better" and stop taking meds, but if your wife is willing to work with you, and you're not willing to trust her when she says "don't stop taking the meds" then there are other issues here besides the bi-polar. Maybe the bi-polar is a bit of a crutch???
In any event, when there are children to think of, all bets are off IMHO. A child needs stability. A child doesn't need the instability of not knowing from minute to minute what to expect at home. My mother was a chid of an alcoholic, and her behaviors to this day are very indicative of her growing up never knowing what to expect at home, never knwoing how Dad was goign to be behaving, if he was going to be drunk or sober, home or gone, mean or nice.
Sorry, time to protect the child. The adult will have to take care of himself. especially if I have tried and there has been no cooperation.