When taking your baby to the doctor your pediatrician will perform more accurate measurements.  Pediatricians do the “baby measuring thing” on a daily basis and will be able to achieve a much more accurate result than you will at home.  This is due to the fact that they are accustomed to the things babies do that can result in an inaccurate measurement and they have very accurate measuring tools made specifically for the purpose of measuring the characteristics of babies, such as proper baby scales equipped with cradles.  Your doctor will most likely take measurements several times during one visit and average the results together to ensure accuracy and to compensate for any discrepancies that may arise.  It is crucial for the doctor’s measurements to be as accurate as possible because a discrepancy of as little as a few millimeters in length or a few grams in weight can make a difference where your baby falls on the charts.  Since the results of these measurements may determine changes to your baby’s diet, and other possible changes to how your baby is fed and treated during her first year, it is important that these results are as accurate as possible.

Your pediatrician will measure the following characteristics of your baby:

Weight: After calibrating the scale the doctor or nurse will place your completely naked baby on a baby scale.  There are electronic and traditional beam-type versions of the baby scale, but most will typically have the same type of baby holding stainless steel cradle.  After your child is able to stand on her own, your pediatrician will most likely use a standard upright scale.

Length: Like weighing, until your baby is able to stand up on his own, your doctor will perform the height/length measurements with your baby lying down.  Your doctor may use a tape measure, much like you use at home, or may utilize a special “baby-measuring device”, which consists of a headboard and movable footboard to obtain the most accurate results possible.

Head circumference: This measurement will be taken in almost the same way you did at home.  The doctor will take the measurement at the point where the head is at its largest circumference, right above the ears and around to the back of the head where the neck meets the cranium.  Usually the pediatrician will record this measurement to the nearest 0.3 cm (1/8th of an inch).

The head is different from other parts of the body in that the brain is not fully formed at the time of birth and therefore the head will continue to grow during baby’s first year.  Baby’s head is a particular point of concern for the doctor because a head that is growing too rapidly can be a sign of hydrocephalus (water on the brain) and a head that is growing too slowly can be indicative of nutritional or developmental problems.  Regardless, you shouldn’t be too concerned if your baby’s head appears a bit disproportional compared to the rest of her body,  as this is completely normal for the first year of life.