For starters, mechonium in utero happens all the time, its definitely not a death sentence. Like someone else kind of explained O is always recessive, while A and B or dominant so two B parents have a 25% chance of having an O type blood child. It would be helpful if you knew who was neg or pos. As far as the breathing problems go,most people develop COPD to some degree or another w 20 pack years ( 1 PPD for 20 yrs). I'm sorry you went through all that, but you really can't be sure without either a DNA test or you could narrow down the pronability w HLA typing. Good luck.