It is variable among individual babies. In general, the first baby teeth that appear in the mouth are the lower front teeth and they usually erupt between the age of six to eight months.

Baby teeth or primary teeth are important to your child's dental health for several reasons:

• They help your child chew and speak properly
• They help guide the permanent teeth into place
• They help maintain the proper spacing of the permanent teeth
• They help preserve the health of the jawbone

Therefore, it is important to take good care of your child's baby teeth and to address any problems that may arise.

Bottle-feeding decay, also known as baby bottle tooth decay, is a type of tooth decay that can occur in young children who are given a bottle with sugary liquids (such as milk, formula, or juice) to drink at night or for long periods of time during the day. To prevent bottle-feeding decay, it is important to:

• Avoid giving your child a bottle with sugary liquids at night or for long periods of time during the day
• Avoid putting your child to bed with a bottle or sippy cup
• Clean your child's teeth and gums after each feeding
• Introduce a cup for drinking by the age of 1
• Limit your child's intake of sugary drinks and snacks.
• Oral hygiene measures must be implemented by the time of eruption of the first primary tooth.
• Consultation with a pediatric dentist after the eruption of the first primary tooth is recommended.
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To protect your child's teeth, lips, cheeks, and gums from sports injuries, it is important to use soft plastic mouthguards, helmets, and face masks. 

• Encourage your child to wear a mouthguard while participating in sports.
• Choose a mouthguard that fits properly and is comfortable for your child to wear.
• Check the mouthguard regularly for signs of wear or damage and replace it as needed.
• Encourage your child to follow proper rules and techniques for their sport to reduce the risk of injury.

Dental X-rays are generally safe for children, but the use of X-rays should be minimized to reduce the child's exposure to radiation. Your child's dentist will use a lead apron or thyroid collar to protect your child's body from radiation, and the amount of radiation used in dental X-rays is low. The benefits of dental X-rays, such as the ability to detect problems early and plan appropriate treatment, generally outweigh the risks.

The thumb-sucking habit is generally not harmful to a child's dental health in the first few years of life. However, if the habit continues beyond the age of 4 or 5, it can cause problems with the alignment of the teeth and the development of the jaw. To prevent these problems, it is important to encourage your child to stop thumb-sucking by:

• Praising your child for not sucking their thumb
• Providing positive reinforcement, such as stickers or rewards, for not sucking their thumb
• Offering alternative behaviors, such as chewing on a chew toy or blanket, to replace thumb-sucking
• Using a reminder, such as a bandage or mitten, to help your child remember not to suck their thumb

To prevent tooth decay in children, it is important to:

• Start brushing your child's teeth as soon as they appear
• Brush your child's teeth twice a day with a fluoride toothpaste
• Floss your child's teeth daily
• Limit your child's intake of sugary drinks and snacks
• Encourage your child to drink water
• Visit the dentist regularly for check-ups and cleanings

Following these steps and establishing good oral hygiene habits early on can help prevent tooth decay and ensure that your child's teeth and gums remain healthy.

Starting at birth, clean your child’s gums with a soft infant toothbrush or cloth and water. Parents should use a tiny smear of fluoride toothpaste along with a soft, appropriate age-sized toothbrush to brush baby teeth twice daily as soon as they erupt. Once children are 3 to 6 years old, then the amount of toothpaste should be increased to peanut size.