i think about 30 weeks sounds good for the baby shower. i am not having mine until about 33 weeks, but that is because we are moving house before then.

about sleeping on their backs, i personally think that if sleeping them on their back reduces the possibility of SIDS then it is so worth it. even if they do get a bit of a flat head, some things are more important. maybe that is me being a paranoid & cautious first timer, but thats just how i feel. im sure you will do what seems best for you,

Linda