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The first equation for calculating ideal body weight is Broca's index, which was modified to calculate 100 lbs. for the first 5 feet and 5 lbs. for every inch over 5 feet for women. According to the Broca's index, at 5 feet, 4 inches tall, women should weigh 120 lbs.A more recent equation known as the Devine formula utilizes the same concept, except with kilograms. The ideal body weight according to this formula is equal to 54.7 kg or 120.59 lbs.he normal BMI range is 18.5 to 24.9. For a height of 5 feet, 4 inches, the normal weight range includes 110 to 145 lbs.
Averages for Boys 3 to 18 Years Old. Keep Kids Healthy cites that at 5 years old, the normal weight for a boy is between 30 to 45 lbs. The ordinary height for a 5-year-old is 40 to 45 inches.t 3, a boy should weigh between 27 Â½ to 36 Â½ lbs., and his height is between 35 to 39 inches. Keep Kids Healthy cites that at 5 years old, the normal weight for a boy is between 30 to 45 lbs. The ordinary height for a 5-year-old is 40 to 45 inches.