My 6 year old has only lost 4 teeth so far, top two and bottom two, bottom two growing back fine, top one's, well first milk tooth fell out and his new tooth is half wa down, looks lovely and sweet, but the other one, which fell out about a week later, back in january 2008 has not even broken through the skin yet, is this normal? I am no expert on how long teeth take to grow back, but I thought the other one would have broken through the skin by now or am I just worried over nothing?