Even their adult teeth are so tiny. It is hard to tell them from thier baby teeth especially on the bottom. It is normal for them to loose their first tooth around the age of 4mths, and they will loose their fang teeth about 6 mths. Their new teeth replace the older ones so fast it is easy to miss that they loss them. As for the cracking is it the baby teeth? If so what things are you giving him to chew on? He may need a little more calcium in his diet. I have heard of their baby teeth cracking before they fall out. Good luck.
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