According to the Centers for Disease Control and Prevention's Weight-for-age Percentile, the average weight of a 19-month-old boy is around 11.8kg. Doctors and other medical professionals have the correct equipment to determine your child's weight; a home scale may not be dependable.
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Overweight and Underweight
If your son weighs over 13.6kg. at 19 months, he will be in the top 10 per cent for toddlers his age. He will be in the bottom 10 per cent if he weigh less than 10.4kg. at 19 months. Those with concerns about a child's weight should contact a physician.
Bottom Line
Should your child be far from average weight for someone of his age, it is important not to panic. The Centers for Disease Control and Prevention says that "to help your child maintain a healthy weight, balance the calories your child consumes from foods and beverages with the calories your child uses through physical activity and normal growth."