Without an injury, a lawsuit would be fruitless. Hopefully, it's an isolated incident.
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Since it appears that you son needs this specific brand of formula, then carefully examine the contents of the 2 cans before using them. Since your son was not injured you have no basis to sue the company because there are no damages.
DISCLAIMER: David J. McCormick is licensed to practice law in the State of Wisconsin and this answer is being provided for informational purposes only because the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship.