com.usegrowo/growo-growth

Tools

• birth_size_percentile

  Where a birth measurement sits on the Olsen 2010 intrauterine curves, for the number of completed weeks of pregnancy. This answers a different question from the growth charts: not how a child grows over time, but how big they were on the day they were born given how long the pregnancy ran. A 2.2 kg baby at 34 weeks and a 2.2 kg baby at 40 weeks are not the same situation, and the WHO charts cannot tell them apart. Returns the percentile, the z-score and the SGA/AGA/LGA category, which is a statistical classification and not a diagnosis.

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• bmi_percentile

  Computes BMI from weight and height, then places it on the BMI-for-age chart for the child's sex and age: the WHO standards under 24 months, the CDC 2000 growth charts from 24 months to 240 months (20 years), the split the CDC advises. From 24 months the result also carries the CDC percentile range it falls in (below the 5th, 5th to below the 85th, 85th to below the 95th, 95th and above). BMI in childhood is read against age and sex, never against the adult 18.5–25 bands. Same functions and tables as the child BMI calculator on usegrowo.com. Returns no interpretation.

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• child_age

  The exact calendar age from a birth date: whole years, months and leftover days, plus the total in months, weeks and days. Use it for 'how old is my baby in months', 'age in weeks' and for turning a birth date into an age in months. This is the age since birth, not the age corrected for prematurity. Dates are YYYY-MM-DD.

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• convert_measurement

  Converts a weight (kg, g, lb, oz) or a length (cm, m, in, ft) to every common unit, so a measurement quoted in pounds and ounces or feet and inches can go into the growth tools, which take kg and cm. For '7 lb 4 oz' pass value 7, unit lb, extra 4; for '2 ft 3 in' pass value 2, unit ft, extra 3.

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• corrected_age

  The corrected age of a baby born before 37 weeks: the age since birth minus the weeks the baby was early. Use it for 'what is my preemie's corrected / adjusted age', for reading milestones, and for choosing the age at which to plot growth. Takes the birth date and the gestational age at birth and returns the corrected age, the age since birth, the original due date, and the date by which correction usually stops (about 24 months since birth). Before the due date there is no corrected age, and the result says how many days remain. A baby born at 37 weeks or later needs no correction. Dates are calendar dates (YYYY-MM-DD).

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• development_milestones

  WHO motor-development windows that are open, already closed or not yet due at a given age, plus the nearest CDC well-child checkpoint months. Windows are 1st–99th percentile ranges from the WHO Motor Development Study — a child inside a window is within the normal range.

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• fetch

  Retrieve the full text (Markdown) of a Growo article or calculator page by the id that search returned. The result includes the page url.

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• growth_percentile

  Where one measurement of a child sits on the WHO or CDC growth reference chart. Returns the percentile, the z-score and the 3rd/15th/50th/85th/97th percentile values at that age, using the same LMS tables as the calculator on usegrowo.com. Returns no interpretation.

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• growth_reference_range

  The 3rd/15th/50th/85th/97th percentile values for a given age and sex — the reference band itself, with no child's measurement involved. Use this to answer 'what is normal for this age'.

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• growth_trend

  What moved between two measurements of the same child: the percentile and z-score at each point, how far the position shifted, and how many of the drawn 3rd/15th/50th/85th/97th lines were crossed. Band crossings are the unit that matters — one is common while a child settles onto their own curve, two downward is the pattern clinicians review. NOT a velocity percentile: WHO's separate Growth Velocity Standards are not implemented here, so this reports movement across the attained-growth chart and never claims a percentile for the rate of gain itself.

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• growth_velocity

  How fast a child grew between two measurements: the change, and the rate per day, per week and per 30 days. Use it for 'how many grams a day is my baby gaining' and 'how many cm did my child grow'. Weight in grams, length and head circumference in centimetres, dates as YYYY-MM-DD. It states the rate and does not compare it with a reference.

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• newborn_weight_change

  How far a baby's weight is from the birth weight: the change in grams and in percent, and whether the baby is back at or above birth weight. Use it for 'how much weight has my newborn lost', 'newborn weight loss percentage' and 'has my baby regained birth weight'. It is arithmetic on two numbers and does not say whether the change is expected. Grams only: 3400, not 3.4.

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• ponderal_index

  The ponderal index (Rohrer's index) from weight and length: 100 x weight in grams / length in cm cubed, with the same quantity in kg per cubic metre. It is a newborn proportion measure; BMI-for-age is the usual measure for older children. It returns the number and does not place it against a range.

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• search

  Search Growo's physician-written articles and calculators on baby and child growth, percentiles, growth charts, premature babies (corrected age), head circumference, sleep, feeding and development. Returns a short list of results, each with an id, a title and the page URL. Each id can be read in full with fetch. The articles are educational and not medical advice.

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• target_height

  The adult height a child is expected to reach, estimated from both parents' heights with Tanner's mid-parental method: (mother + father +13 cm for a boy, -13 cm for a girl) / 2, with a range of 8.5 cm either side. Use it for 'how tall will my child be', 'mid-parental height' and 'child height predictor' questions. It is a statistical range, not a forecast for one child, and says nothing about the child's height today. Centimetres only: convert feet and inches first (5 ft 10 in = 177.8 cm).

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• zscore_percentile

  Converts a z-score (standard deviations from the median) to a percentile and a percentile to a z-score on the normal curve, the relationship growth charts use. Pass exactly one of zScore or percentile. It converts the number and does not say what it means for a child.

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