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Nutrition and weight management before and during pregnancy has a profound effect on the development of infants. This is a critical time for healthy fetal development as infants rely heavily on maternal stores and nutrient for optimal growth and health outcome later in life. Birth weight of the newborn at delivery reflects the quality of maternal nutrient for the fetus during pregnancy. Prenatal nutrition has a strong influence on birth weight and further development of the infant.
Maintaining a healthy weight during gestation lowers adverse risks on infants such as birth defects, as well as chronic conditions in adulthood such as obesity, diabetes, and cardiovascular disease (CVD). Ideally, the rate of weight gain should be monitored during pregnancy to support the most ideal infant development.
Women are classified as underweight if they have a pre-pregnant BMI of 18.5 or below. Low pre-pregnancy BMI increases the risk of low birth weight infants, but the risk can be balanced by an appropriate gestational weight gain from 12.5 to 18.0 kilograms in total, or about 0.5 kilogram each week in the second and third trimesters.
Underweight women usually have inadequate nutrient stores that are not enough to provide for both herself and the foetus. While exercise and a proper diet are both very important to maintain the recommended weight gain, a balance between the two is essential. As such, underweight mothers should seek individualized advice tailored especially for them.
Overweight and Obese Women
Women with a high pre-pregnancy weight are classified as overweight or obese, defined as having a BMI of 25 or above. Women with BMI between 25 and 29.9 are in the overweight category and should gain between 7.0 and 11.5 kilograms in total, corresponding to approximately 0.28 kilogram each week during the second and third trimesters. Whereas women with BMI of 30 or above are in the obese category and should gain only between 5.0 and 9.0 kilograms overall, which equates to roughly 0.2 kilogram per week in the second and third trimesters.
In general, walking is encouraged for mothers classified in this category. They are encouraged to record activity and intake level. This can be done with the help of tools that are available online. In extreme cases where the BMI exceeds 35, help from a registered dietitian is recommended.
In order to have a good estimate of birth weight, an ultrasound during pregnancy and the date of last menstrual period are needed. Measured values from the ultrasound are compared with the growth chart to estimate foetal weight. Crown to rump length can be used as the best ultrasonographic measurement for correct diagnosis of gestational age during the first trimester. This correlation between crown to rump length and gestational age would be most effectively shown when no growth defects are observed in first trimester. If growth defects were observed in the first trimester, then the measurement of the date of last menstrual period becomes quite important since the crown heel length has become less of a reliable indicator of gestational age.
After the 20th week of pregnancy, the mother would need to visit the doctor for the measurement of height, which is the length from the top portion of the uterus to the pubic bone. The length measured in centimeters should correspond to the number of weeks that the mother has been pregnant. If the measured number is higher or lower than 2 centimetres, further tests using ultrasound would be needed to check the results. Another way to estimate foetal size is to look at the mother’s weight gain. How much weight the mother gains can be used to indicate foetal size.
Research show that when birth weights of infants are greater than the 90th percentile of the growth chart for babies of the same gestational age, they are considered large for gestational age or LGA. This indicates that these babies are weighing more than 90% of babies of the same gestational age.
Many factors account for Large for Gestational Age babies, including genetics and excessive nutrient supply. It seems that a common factor for LGA babies is whether or not the mother has diabetes when she is pregnant. An indicator for excessive growth, regardless of gestational age, is the appearance of macrosomia. Many complications are observed for LGA babies and their mothers. A longer delivery time may be expected since it is a difficult birth. The infant would likely suffer hypoglycaemia (low glucose level in the blood) after birth. The infant would also have difficulty breathing.
There might be a need for early delivery if the baby gets too big and perhaps Caesarean section would be needed. Since the baby is bigger in size, there’s a higher chance of injury during delivery. To increase the blood glucose level in blood, a glucose/water solution can be offered to the infant.
There are ways to help prevent LGA babies. It is necessary to monitor fetal growth and perform pregnancy examinations to determine health status and detect any possibility of unrecognized diabetes. For diabetic mothers, careful management of diabetes during pregnancy period would be helpful in terms of lowering some of the risks of LGA.
Points to Consider
The goal of pregnancy is to have a healthy baby. Maintaining healthy and steady weight gain during pregnancy promotes overall health and reduces the incidence of prenatal morbidity and mortality. This, in turn, has a positive effect on the baby’s health.
Since conditions during pregnancy will have long term effects on adult health, “moderation” should be taken into account for both dietary and physical activity recommendations. Most importantly, the total recommended pregnancy weight gain depends on pre-pregnant body weight, and weight issues should be addressed before pregnancy.
Practical Advice for Mothers
The following general tips can be helpful to pregnant women. It would be beneficial to maintain adequate physical activity to meet energy needs from the food consumed. Eating a balanced diet would be optimal for healthy pregnancy results. To prevent problems like dehydration and constipation, it is important to drink enough fluids, especially water, to support blood volume increases during pregnancy. It is recommended to accompany regular meals with a daily prenatal vitamin supplement that has sufficient folic acid and iron content.
If the fetus is predicted to have low birth weight, in addition to the general recommendations, it would be ideal to increase caloric intake, which can be done by having extra Food Guide Servings daily. If the fetus is predicted to have high birth weight, smaller and more frequent meals should be consumed to allow better weight management. Moderate sugar intake, such as fruit juices, is also suggested. It is essential to limit food and beverages with high calories and salt content.












