The case should be on the venue where Austin bought the infected formula manufactured by Nestle USA Inc.
It doesn't affect if the baby was born in South Carolina: They cant say the alleged harm occur there just because the baby was born there. The harm occurred where Austin bought the formula by Nestle, if the formula was bought in Minnesota, South Carolina shouldn't be involved in this case just because Austin's residency.
The case shouldn't be transferred, the final verdict it should be determined by the laws of the state where the harm object (In this case the formula) was bought and consumed.