Sorry to hear you're dealing with this double whammy.
My AH is bipolar, knows it, and won't deal with it, just like he won't with his drinking (or anything else, really). The situation is nightmarishly unbearable, so I can't fathom having a small/developing child involved, but the only option I could see would be to remove us both from his presence ASAP until he can completely address/arrest both problems...and they are each monumental (with emphasis on the "mental").