Baby teeth are actually referred to as the primary teeth. Teeth first begin to appear in the child between the 4th and 18th month of age. By the time your child reaches 3, they should have all of  their primary teeth. The Permanent Teeth will begin to come in at approximately 6 years of age. Permanent teeth come in under the primary teeth and cause their roots to slowly dissolve. All of the permanent teeth should be in by theage of 13.

There are 20 primary teeth
Unlike the permanent dentition,
The primary dentition has no premolars.

Dental care should start early for your child. Naturally, at first you'll have to care for and clean their teeth. Begin cleaning the baby teeth as soon as you see the first one in place. Use a small gauze or wash cloth to first clean the teeth. Begin to use a brush as soon as you can - place just a small amount of toothpaste on the brush so that they may get the idea to brush - not -eat the toothpaste.

“Bottle mouth”   occurs when a child sleeps with a bottle in their mouth. Liquids (EVEN MILK) that stay in the mouth continuously can cause rapid decay.

Thumb sucking and pacifiers are a a very normal habit for a newborn, but, should not go beyond 36 months because it may lead to serious problems of jaw mal-formation and tooth displacement.

You as the parent should be observing and checking the teeth yourself  to see if there are any signs of darkness which may be decay.