This is a good chart. Although, I think the teeth are smiling because they find it funny how miserable they make everyone. 9 months old, and Sophia already has 6 teeth! Poor sweet baby has been miserable the past few nights!
Teething for babies normally starts from 6 months of age. However, it can be anytime between 3 months and 5 months. The lower front teeth comes first; they are called as lower central incisors. You're supposedly to see 20 primary teeth of your baby at the age of 3. Apart from that as a parent, you should know how to take care of your baby's teeth properly so that remains clean, strong, and cavity-free. Learn here the details about baby teeth order and its care.