eight teeth at nine

Normally, teethe appear at 6 months baby, or maybe 7. But, different to my baby. She got her first and second teeth when she was 5 months. She always bite hard things especially her toys. Then, she can crawl when she is 7 months. At the same time, she got 4 teeth. Then, when she was nine months, she got totally 8 teeth. She is now is 10 months and she can handle her legs very well. She can walk!!