Sometimes it is an issue that parents keep C”Y but grandparents don’t. So when kids are little and grandparents offer a chocolate or want to give a cookie that is ou-d, or even a bottle, etc. Parents don’t necessarily want to make a fuss if the child is very young. That is why I say one should not judge or discuss what OTHERS should or shouldn’t be doing. One should only discuss what they choose to do for themselves or ask questions pertaining to what they want to know for themselves.
Obviously similac is not C”Y but a baby needs it, so parents will use it for the infant. When children are very young and do not understand the concept, parents may choose to make exceptions for whatever reasons they choose, as I have mentioned and there is no reason for others to speculate or judge. However, if one is asking for themselves if THEY should make exceptions that is something that a couple have to talk about and maybe discuss with their own RAV.