Baxter Healthcare Corp. maker of the blood-thinning drug Heparin, was named as a defendant in a lawsuit filed today in Chicago by Dennis and Kimberly Quaid. The couple claim that the vial labels on two vastly different doses of Heparin — 10-units-per-milliliter and 10,000-units-per-milliliter — are virtually identical, and it was that similarity which led a hospital employee to mistakenly administer a potentially lethal dose of the drug to the Quaid’s newborn twins, Zoe Grace and Thomas Boone, turning 1-month on Saturday.

An attorney for the couple told the Chicago Sun Times that the twins "were critical for a while" after the incident, which occurred at Cedars-Sinai Medical Center in Los Angeles, but "everything looks good" for them now. The attorney added that three children died in an Indiana hospital from a similar mix-up, and the Quaids want to prevent the tragedy from ever occurring again.

Of the twins, the Quaids’ rep says,