Hi there ..these are called "nursing bottle caries."..you might be feeding your son milk at night before sleep which is the major cause of such cavities or discoloration...
You can give him water after every feeding..or just wipe his teeth with a wet n clean gauze to remove the sugary milk from tooth surface...visit a nearest pediatric dentist and get it treated followed by using a tooth creme called " GC Tooth mousse" 3-4 times daily...
Toothpaste is not recommended below age of 3 as it contains fluoride which is harmful if swallowed and at this age kids do swallow toothpaste. iron supplements could be a reason for staining in kids teeth. Decay can occur if bottle is kept in the babys mouth for long periods of time. ..or pacifiers are dipped in honey. Clean your baby's teeth with a finger brush or cotton. Do not let him sleep with a milk bottle in his mouth. Give him water to drink after food.
Brush his teeth regularly with a finger brush yourself. After every meal. Caries are possible but not very common at this age. If at all your kid is having any iron suppliments, the teeth can turn brownish. Consult a pedodontist in yourarea to rule out any probability of caries.
Search on Google for your nearest available pedodontist.
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