How can you maintain doctrines of "Election" and "Limited Atonement", and believe that all infants, not just those who are "elect", who die will go to heaven? That this is the view of heavy-weight Calvinists, like, Charles Hodge, W. G. T. Shedd, and B. B. Warfield, can be seen from this link, http://www.reformed.org/calvinism/boettner/infants_boettner.html
This, of course raises the question, when does a person become "elect"? If both the infants who are elect and non-elect go to heaven when they die, then, we can only conclude from this that Christ died for the non-elect as well? We read of David's son by Bathsheba, that when David heard that he had died, how he celebrated by a feast, and said, that, "Can I bring him back again? I shall go to him, but he shall not return to me" (2 Samuel 12:23). There is no evidence that David's son was part of the "elect", yet we read of David's confidence that his son had gone to heaven, where he would join him. Clearly showing that all who die in infancy will be saved.
This, of course raises the question, when does a person become "elect"? If both the infants who are elect and non-elect go to heaven when they die, then, we can only conclude from this that Christ died for the non-elect as well? We read of David's son by Bathsheba, that when David heard that he had died, how he celebrated by a feast, and said, that, "Can I bring him back again? I shall go to him, but he shall not return to me" (2 Samuel 12:23). There is no evidence that David's son was part of the "elect", yet we read of David's confidence that his son had gone to heaven, where he would join him. Clearly showing that all who die in infancy will be saved.