Normal Head Circumference Newborn
From age 6 to 24 months his head and chest will have about the same circumference. A doctor or physician should be consulted to determine growth status.
Tracking Infant Growth Average Baby Weight And Height By Month
Normal head circumference for newborns and what smaller head sizes mean.
Normal head circumference newborn. The head circumference of newborn boys tends to be greater than that of newborn girls as males are born larger and grow faster than females. The distance around the baby s head. The average newborn s head measures 13 3 4 in 35 cm generally a newborn s head is about half the baby s body length in cm plus 10 cm.
So a baby that is 18 inches long would be 45 7 centimeters 18 x 2 54. Normal head circumferences in term infants range from 32 to 38 cm. The baby head circumference of a healthy full term baby is between 12 5 to 13 5 inches that are 31 75 34 29 centimeters.
It is approximately two to three centimeters larger than the chest circumference which when measured at the nipple line is between 30 and 33 centimeters twelve to thirteen inches. For an adult male average head circumference is 22 inches. Having a normal head circumference for a 3 month old approximately 15 to 16 inches can be an important indicator of a newborn s health and is one of the key measurements your pediatrician will take regularly through this important developmental stage.
Conversely macrocephaly is defined as a head circumference greater than 2 sds above the mean or greater than the 98th percentile. The normal or average head circumference of a person varies by age and by gender. For an adult woman it is 20 inches.
A value below 50 percent means a baby s head circumference is less than the average. 3rd percentile head circumference in centimeters 5th percentile head circumference in centimeters 10th percentile head circumference in centimeters 25th percentile head circumference in centimeters 50th percentile head circumference in centimeters 75th percentile head circumference in centimeters. Normal head circumference for the first six months of your baby s life his head will measure approximately 2 centimeters bigger than his chest.
A full term neonate will commonly have a head circumference between 13 14 inches. A percentile of 50 represents the average or mean head circumference. An average baby head circumference is 12 inches for premature babies and 14 inches for an average sized baby.
This measurement is approximately 1 inch greater than the same infant s chest and abdominal girth measurements. A newborn s head circumference measured at the level of the baby s eyebrows is between 32 and 36 8 centimeters 12 6 to 14 5 inches. A value greater than 50 percent means a baby s head circumference is above average.
After two years the baby s head will measure smaller than his chest. Microcephaly is defined as a head circumference 2 standard deviations sds below the mean for age and sex or roughly less than the 2nd percentile.
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