That's right. When making your baby's formula, use the cold tap instead of the hot one to reduce the chance of contamination from lead or other minerals. If your home has any lead in the plumbing, the hot water will leach more of it out of the pipes than cold water will.
Also, the longer water stays in the pipes, the greater the potential exposure to lead – even from a cold tap. So, if the water in your pipes hasn't been used for a few hours, run it for about 15 to 30 seconds before making your baby's formula. This flushes out the pipes and reduces the chance that there will be lead in the water.
The U.S. Food and Drug Administration (FDA) recommends bringing cold tap water to a boil, boiling it for one minute, and then cooling it before using it for formula.