Sending positive vibes to bub and his family. There are many positive stories of ex 28weekers doing exceptionally well. I believe the survival rate is now excellent. I would however have concerns if bub is really only 12oz. That is only 340grams which is absolutely tiny for a 28weeker. Is there any chance the dates are incorrect and bub is infact earlier? As if this is the case the chances of survival will be reduced. If bub is definitely 28weeks and only that size he has been compromised for a long time so there are also other factors to consider not just gestation.
I don't want to be negative and do hope to God bub is strong and a little fighter.