SPECIAL OFFER: - Limited Time Only!
(The ad below will not display on your printed page)

Say YES to your FREE SUBSCRIPTION today! Simply fill in the form below and click "Subscribe". You'll receive American Baby® magazine ABSOLUTELY FREE! (U.S. requests only)


First Name:

Last Name:





Mother's Birth State: 
Is this your first child?
Due date or child's birthdate:
Your first FREE issue of American Baby® Magazine packed with great tips and expert advice will arrive within 4 to 6 weeks. In the meantime, your e-mail address is required to access your account and member benefits online, but rest assured that we will not share your e-mail address with anyone. Free subscription is subject to publisher's qualifications. Publisher bases number of issues served on birth and due dates provided. Click here to view our privacy policy.

How Does Your Baby Grow?

Q: How were the growth charts compiled, and how should parents use them?

A: The charts (one for boys, one for girls) were devised by the federal Centers for Disease Control, in Atlanta, on the basis of 31 years of data collected from thousands of children. The recently updated tables (see The New Growth Charts) track the growth of healthy kids from birth to 20 years of age by plotting height, weight, and head circumference.

The purpose of the charts isn't to compare your child with others -- generally, any weight or height between the 5th and 95th percentiles is considered normal. Instead, physicians use the stats as a reference point -- watching for consistent growth over time. "A baby can remain in the 5th percentile for any of these measurements indefinitely and still be considered healthy, as long as he continues to grow," says Mark Widome, M.D., a professor of pediatrics at Pennsylvania State University, in Hershey, and a Parents advisory-board member.

Q: My husband and I are short, but our baby is in the 90th percentile for length. Will she be tall?

A: "A child's length at birth does not necessarily indicate future height," says Frank Greer, M.D., a professor of pediatrics and nutritional sciences at the University of Wisconsin at Madison. "Small parents can have a very large baby, for reasons related more to intrauterine nutrition than to genes. For instance, a short mother with even a mild case of gestational diabetes can have an infant who is large for his age, not only in terms of weight but in length and head circumference as well." Still, family traits come into play fast: "In the course of the first year, usually by the second half, a baby's growth will probably fall more in line with his parents' patterns," Dr. Widome says.

Q: My baby is in the 10th percentile for weight. Should I supplement her feedings to try to get her closer to the 50th percentile?

A: "Growth charts do not represent any ideal, and bigger is not necessarily better," says Lawrence Hammer, M.D., an assistant professor of pediatrics at Stanford University School of Medicine, in Stanford, California. Small babies should be fed the same as larger ones and watched only for steady weight gain. Similarly, a large baby who is growing consistently should not be put on a restricted diet.

Q: Is a rapid gain in height or weight any cause for alarm? How about an unexpected drop-off?

A: Though growth charts help in spotting such fluctuations, the reality is that an infant's growth is often marked by variation. "We look for patterns -- some babies follow a nice even curve, and some have a pattern of plateaus," says Barbara Fritz, a dietitian in Greenfield, Massachusetts, who works for the Women, Infants, and Children program (serving at-risk mothers and children) in the western part of her state.

Because they grow in leaps, Dr. Widome says, "infants can move up and down the charts a bit as part of normal growth patterns." The key is how fast and drastic the transition is. "If your baby has been at the 50th percentile and drops to the 5th, for instance, the doctor will want to explore why the growth pattern has been interrupted," he says. Possible causes include illnesses such as diabetes or other endocrinologic problems. There are also conditions that could lead to a dramatic jump in growth. More often, though, the cause is a growth spurt or improved nutrition.

Q: Should my infant's height and weight fall in the same percentile?

A: These two measurements should correspond closely -- you'd expect a baby in the 60th percentile for height to be near the 60th for weight as well. The new growth charts have an index that gauges whether an infant's weight correlates desirably with his height.

Q: Why is my baby's head measured at every visit? What if her head is in the 90th percentile while her height is in the 50th?

A: A baby's brain and head do 80 percent of their growing during the first two years. Measuring head circumference helps doctors track the brain's growth as the skull bones knit.

Rest assured, it's not uncommon for a baby's head size to seem disproportionate to her height and weight. The usual explanation is genetics: If a baby's parents have big heads, the baby will probably have one too. The head's size relative to the rest of the body is less important than a consistent pattern of growth.

Related links:

The latest versions feature some important changes, resulting in more accurate measurements and a more global view of infants.

  • They're more ethnically inclusive. The old growth charts, published in 1977, were based primarily on a survey of mostly white, formula-fed babies who were living in southwestern Ohio. The new charts , compiled by the Centers for Disease Control, in Atlanta, and the National Center for Health Statistics, in Hyattsville, Maryland, are more reflective of the increasingly diverse U.S. population.
  • They list BMI. A major change is the inclusion of the BMI (body-mass index), numbers that evaluate a child's weight in relation to her height. The intention is to combat escalating childhood obesity by targeting at-risk children early on (as young as age 2, in some cases) and getting parents to provide their children with healthier and more well-balanced diets.


Related links: