If you are expecting a baby, Congratulations!
As a dentist, I wish to advise you to familiarize yourself with the timing of baby teeth eruption. The first teeth to come out are the lower front teeth. These teeth come out at the age 6 to 10 months and will stay in the mouth up to the age 6 or 7 years. The last primary teeth to erupt in the mouth are the upper second molars which erupt at the age 25 to 33 months and will shed around the age 10 to 12 years.
It is really important to keep track of the eruption and shedding of the teeth. Some kids are slower or faster than others but usually the opposite side will erupt or shed within 6 months.
Teeth vary in size, shape and their location in the jaws. These differences enable teeth to work together to help you chew, speak and smile. They also help give your face its shape and form. At birth people usually have 20 baby (primary) teeth, which start to come in (erupt) at about 6 months of age. They fall out (shed) at various times throughout childhood. By age 21, all 32 of the permanent teeth have usually erupted.
Click here to learn more and view eruption chart at the ADA website.