YSK You should Use only cold water for drinking, cooking and making baby formula. Hot water from the tap has an increased chance of containing lead. Lead is harmful to health, especially for children.
from /r/YouShouldKnow
YSK 你应该只用冷水来饮用、烹饪和制作婴儿配方奶粉。自来水中的热水含铅的机会增加。铅对健康有害,特别是对儿童。