My baby is 13 month and she has only one teeth..there is no trace of another?

teeth yet.She eats semi solids like milupa veggie cereal,banana puree,rice wth curd or dal,bread soaked in milk etc..but she can eat idli or dosa..as its hard for her.when will my baby get the other teeth?I have seen many of my frnds kids of the same age ha 8 to 12 teeth.Is it a cause to worry tht my baby is having only one teeth?