Most medications do so at low levels and pose no real risk to most infants. It is also not absorbed into the mother's system, so wouldn't be transmitted in breast milk. The rash occurred after 2 days of therapy in the mother at a dose of 1 gram at bedtime.
3D Model of the Acetaminophen molecule
DHA stands for docosahexaenoic acid. However, since it could potentially cause side effects in the baby, it should not be used more than occasionally and not longer than one week.