The packaging of the blood thinners that were mistakenly switched in a string of Indianapolis hospital errors that killed three premature babies is confusing, the attorney for the families of two of the infants said Thursday.

Nathaniel Lee, who represents the families of Thursday Dawn Jeffers and Emmery Miller, said he would ask Baxter International Inc. to change how it labels the blood thinners heparin and its much-weaker version, hep-lock.