Transit from Shanghai

Hi,
I am India passport holder and thinking to book China eastern flight from Sydney to delhi which has layover in Shanghai.I have below question :
1) I hope 1hr 40 min will sufficient to take connecting flight from Pudon international airport(same terminal I think)
2) On return, I have 19+hrs layover, Can I go outside of the airport? if yes, what about my luggage, do I need to take it out also?I will be travelling with infant.