hi is there taxi in Shanghai for 4 adults plus 1 toddler?

Hi, Nancy. Generally speaking, a cab can only hold four people. But it can be fine to hold you all with your toddler. However, if you have many luggages, you may need two cars.

The maglev station lies between T1 and T2 in PVG, so you may easily get there. Ride the train to Longyang Road. Then you can easily find the cab stands and flag down a cab to your destination. By the way, the first SMT train departs at 7:02 from the airport, so you need to wait for a while after landing at PVG.