Most doctors agree that infants should take vitamin D3, but there is variation among pediatricians and pediatric groups about the ideal dosage of vitamin D for babies. (safbaby.com)
Well, you can point out that water sources are generally cleaner today than back when they were raising babies, and that most major pediatric groups are clear that there is no need to sterilize bottles or nipples. (health-and-parenting.com)
Various pediatric groups recommend much lower levels for fetuses, infants and children. (thelensnola.org)