A–Z Glossary

Growth Trajectory

A growth trajectory is the pattern and direction of a child’s measurements over time rather than a single measurement.

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What percentiles mean for babies

What percentiles mean for babies

What a growth percentile actually represents A growth percentile places one measurement in relation to measurements from a reference group. For example, if a baby’s weight is at the 25th percentile, approximately 25 percent of comparable babies in the reference population weigh less, while approximately 75 percent weigh more. A baby at the 90th percentile […]

Baby height chart first year

Baby height chart first year

How a first-year baby height chart works During the first year, a healthcare professional measures an infant’s recumbent length with the baby lying flat on a length board. The head is positioned against the fixed headpiece, while the legs are gently extended and the feet are placed against the movable footpiece. Ideally, two trained people […]

Weight gain 3 to 6 months baby

Weight gain 3 to 6 months baby

What weight gain is typical from 3 to 6 months? There is no single weight that every 3- to 6-month-old baby should reach. Infants begin this period at different weights, lengths, and percentiles, and healthy babies can follow many different growth patterns. The clinically useful question is usually whether the baby is gaining weight along […]

Why baby is not gaining weight

Why baby is not gaining weight

What slow weight gain means Babies do not gain weight in a perfectly linear pattern. Short periods of slower gain can occur during minor illness, developmental transitions, or changes in feeding. The clinically relevant question is whether the baby is following an individual growth trajectory and maintaining proportional growth over time. Clinicians commonly assess weight-for-age, […]

Growth comparison feeding types

Growth comparison feeding types

What feeding type can and cannot explain Feeding type is associated with population-level differences in infant growth, but it is only one part of the explanation. Human milk composition changes over time and varies across feeds, while standard infant formulas provide a relatively consistent nutrient composition. Babies also differ in appetite regulation, feeding efficiency, sleep, […]

How often to check baby weight

How often to check baby weight

Routine weight checks for healthy babies In the early newborn period, weight is checked more closely because newborns normally lose some weight after birth and then begin to regain it. A clinician may recommend a review within the first days after discharge and a further assessment during the first couple of weeks, depending on local […]

Growth concerns parents often have

Growth concerns parents often have

Why growth measurements cause so much concern Parents often become concerned when a baby appears smaller or larger than peers, outgrows clothing unusually quickly, gains weight more slowly than expected, or receives a measurement that seems different from the previous visit. These observations are understandable because growth is concrete and easy to compare. However, comparison […]