birth weight

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Related to birthweight: Low birthweight

birth weight

in humans, the first weight of an infant obtained within less than the first 60 completed minutes after birth; a full-size infant is one weighing 2500 g or more; a low birth weight is less than 2500 g.; very low birth weight is less than 1500 g.; and extremely low birth weight is less than 1000 g.

birth weight



The weight of an infant at birth.

birth weight

the measured heaviness of a baby when born, usually about 3500 g (7.5 pounds). In the United States, 97% of newborns weigh between 2500 g (5.5 pounds) and 4500 g (10 pounds). Babies weighing less than 2500 g at term are considered small for gestational age. Babies weighing more than 4500 g are considered large for gestational age and are often infants of mothers with diabetes.

birth weight

The weight of a newborn child which, in the US, averages 3.2 kg at 37-week/term

birth weight

The weight of a newborn child which, in the US, averages 3.2 kg at 37-wk/term. See Low-birth weight, Very low-birth weight.

birth weight

(bĭrth wāt)
In humans, the first weight of an infant obtained within less than the first 60 completed minutes after birth; a full-size infant weighs 2500 g or more; low birth weight is less than 2500 g.

birth weight

(bĭrth wāt)
In humans, the first weight of an infant obtained within less than the first 60 completed minutes after birth; a full-size infant is one weighing 2500 g or more; a low birth weight is less than 2500 g.; very low birth weight is less than 1500 g.; and extremely low birth weight is less than 1000 g.

birth weight,

n the measured heaviness of a baby when born.


a coming into being; the act or process of being born. See also parturition.

birth canal
the canal through which the fetus passes in birth; comprising the uterus, cervix, vagina and vulva.
birth cohort
see cohort.
birth control
a term rarely used in dealing with animals. Instead see population control, contraception.
birth defects
see congenital defects.
birth difficulties
birth injury
occurs to the fetus during birth. Includes rib fracture and meningeal hemorrhage.
birth interval
the interval between succeeding parturitions. See also calving interval.
multiple birth
the birth of two or more offspring produced in the same gestation period.
birth order
the chronological order of births in a multiple birth. May have significance in causing stillbirths if the intervals between births are prolonged because of inertia.
premature birth
expulsion of the fetus from the uterus before termination of the normal gestation period, but after independent existence has become a possibility. In humans prematurity is defined as a pregnancy of less than 37 weeks in a pregnancy normally lasting 40 weeks.
birth process
comprises maturation of the fetus, relaxation of the bony pelvis and associated ligaments, softening and relaxation of the cervix, vagina, vulva and perineum, correct disposition of the fetus, contractions of the uterine myometrium and finally the only component under voluntary control, contraction of the abdominal muscles.
birth rate
the number of births during one year for the total population (crude birth rate), for the female population (refined birth rate), or for the female population of reproductive age (true birth rate). Not a term much used with reference to animals. See calving, lambing rate.
birth size
stature, including height at withers, crown to tail head length at birth.
birth weight
the weight at birth. A significant determinant of survival in any species and of the occurrence of dystocia. See also prolonged gestation.


heaviness; the degree to which a body is drawn toward the earth by gravity. See also Tables 4.1 and 4.2.

apothecaries' weight
an outmoded system of weight used in compounding prescriptions based on the grain (equivalent 64.8 mg). Its units are the scruple (20 grains), dram (3 scruples), ounce (8 drams) and pound (12 ounces). See also Tables 4.2 and 4.3.
atomic weight
the weight of an atom of a chemical element, compared with the weight of an atom of carbon-12, which is taken as 12.00000.
avoirdupois weight
the system of weight still used for ordinary commodities in some English-speaking countries. Its units are the dram (27.344 grains), ounce (16 drams) and pound (16 ounces).
birth weight
weight of the newborn at the time of birth.
body weight
the animal's weight. In herbivores this is often debatable because of the variation in 'gut-fill' depending on the availability of palatable food. In the absence of scales the weights of large animals are often estimated on the basis of their age and their girth just behind the elbow. Called also liveweight. See also body condition score.
body weight-to-surface area
determination of many drug dosages is physiologically more accurate when based on body surface area rather than body weight; used particularly in cancer chemotherapy. For conversion table for use in dogs see Table 21.
equivalent weight
the weight in grams of a substance that is equivalent in a chemical reaction to 1.008 g of hydrogen. See also chemical equivalent.
weight gain
increase in body weight for specific periods; the principal measure of productivity in meat animals.
weight loss
the loss of body weight from that previously measured. This estimate must take into account the difference in 'gut-fill' and the effects of developing pregnancy and recent parturition.
metric weight
see Tables 4.1 and 4.2.
molecular weight
the weight of a molecule of a chemical compound as compared with the weight of an atom of carbon-12; it is equal to the sum of the weights of its constituent atoms. Abbreviated mol. wt. See also Table 6.
shifting weight limb to limb
sign indicative of lameness especially in horses; while standing the horse is continually shifting its weight from one limb to the opposite one of the pair.

Patient discussion about birth weight

Q. what is the normal weight of a baby? what does it say if one weights less or more than the normal ?

A. Here is a site I use very often, and this is the page concerning infants' growth and development. Because it's a statistical measure changing from different ages and races, you might find an answer there. It's all videos of pediatricians lectures:

Q. what is the right weight for a baby who just has been norn to weight ?

A. The average weight for a newborn is 2.5 - 4 kilos. A baby that weighs less than 2.5 kilos is considered 'small for gestational age' and a baby that is born over 4 kilos is considererd 'large for gestational age'.

Q. How to loss weight like a diet with tea,pills or other kind of healthy thing.

A. drink 8 oz of warm water with 1 tablespoon of lemon... first thing in the morning

More discussions about birth weight
References in periodicals archive ?
The NMR according to ethnicity, mean birthweight, mean gestational age, mode of delivery, prenatal care, maternal age, maternal education, incidence of smoking, median household income, number of NICU beds per 10,000 births, and number of neonatal providers and obstetricians per 10,000 females of 15 to 44 years are shown in Table 1.
The investigators matched each VLBW child with the next child born in the same maternity ward who was of normal birthweight and the same sex.
While researchers are still sorting out how being born heavy affects future health, Seppa notes that many of those earlier studies suggesting benefits of high birthweight were published before the obesity epidemic hit full force.
He studied births from 1910 to 1945 and found that the cardiovascular mortality of individuals born during that time was inversely related to birthweight.
Babies born to mothers who live in areas with air pollution and dense traffic are more likely to have a low birthweight and smaller head circumference, according to a large European study.
Air pollutants - in particular fine particulates found in traffic fumes and industrial air pollutants - along with traffic density increased the risk of low birthweight and reduced average head circumference of babies born at term, research has shown.
Birthweight differences are not statistically significant in the IV analysis, but they are of the same magnitude as in the propensity score analysis, suggesting that they are not biased.
Low birthweight was defined as a body weight <2,500 g.
Study leader Professor Tim Spector, from King's College London, said: "Scientists have known for a long time that a person's weight at the time of birth is an important determinant of health in middle and old age, and that people with low birthweight are more susceptible to age related diseases.
One of these, linked to aging traits such as lung function and bone mineral density, is also strongly associated with birthweight -- a well-known developmental determinant of healthy aging.
Individual-level exposures to traffic-related air pollutants at their birth address were estimated by analysing emission from road traffic in the neighbourhood, population density and land use in the area, and the association between air pollution and insulin resistance was calculated using a model adjusted for several possible confounders including socioeconomic status of the family, birthweight, pubertal status and BMI.
Caffeinated instant coffee (568 women) was compared with decaffeinated instant coffee (629 women) and it was found that reducing the caffeine intake of regular coffee drinkers (3+ cups/day) during the second and third trimester by an average of 182 mg/day did not affect birthweight or length of gestation.