Baby teeth usually start to appear around 6 months of age, but the exact timing can vary from child to child. The order in which baby teeth come in is generally as follows:

• Lower central incisors: 6 to 10 months
• Upper central incisors: 8 to 12 months
• Upper lateral incisors: 9 to 13 months
• Lower lateral incisors: 10 to 16 months
• Upper first molars: 13 to 19 months
• Lower first molars: 14 to 18 months
• Upper canines: 16 to 22 months
• Lower canines: 17 to 23 months
• Lower second molars: 23 to 31 months
• Upper second molars: 25 to 33 months

Its important to note that the exact age when a tooth erupts or falls out can vary from child to child, and sometimes teeth can erupt slightly out of order. By the time a child is 2 1/2 to 3 years old, all of their primary teeth should have erupted.