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DS is 20mths old and still nursing many many times a day. He got his first tooth at 18 mths! And then three more the week after. He hasn't gotten any more since. Well, I have a severe Vitamin D deficency, and it turns out that his delayed teething is caused by that! Anyone else experience this? I nursed my other two for almost three yrs each time, and never had the vit. d issue before.