Holy cow...well. I'm sorry that you are still hurting after your miscarriage, but to go at someone like that in public is completely rude and disrespectful! I don't think the girl honestly thought she was doing anything wrong hun, I mean her mother was with her, and it's only natural to show off something she is proud of whether she is 13 or 30. The mature thing to do would have been to just walk away, have a cry in the ladies room or on a friends shoulder. Attacking her in front of a crowd of people only makes you look in the wrong here.

As for having the baby out, it's really a judgement call on that one, since obviously you can't hole up and fresh air, sunshine, being around people and getting used to your surroundings is healthy for a baby. Now you can't just pack and go for hours and hours, but getting out for an hour or two at first isn't really harmful I wouldn't think. Also, there's no problem with people holding him/her, who wouldn't want to cuddle a newborn (I personally turn into a drooling idiot when I see one!), as long as hands are washed first.