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Actually, I didn’t make an exception for infants in terms of grace. They are saved by grace just like other elect people.

Um, yes you did...

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Infants dying in infancy and severely mentally handicapped people never reach a particular chonological age that would be designated as the age of accountability or age of responsibility.

And here too...

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Obviously, infants dying in infancy cannot act in a morally significant way that would lead to their condemnation.

True godliness is a sincere feeling which loves God as Father as much as it fears and reverences Him as Lord, embraces His righteousness, and dreads offending Him worse than death~ Calvin