Final answer:
The fundal height is a measure of the uterus size corresponding to the gestational age. In the third trimester, the fetus undergoes the most rapid growth, reaching full development by the 38th week, with sizeable gains in weight and length.
Step-by-step explanation:
Understanding Fetal Growth and Development During Pregnancy
The fundal height is a measurement used in obstetrics to assess the size of the uterus and the growth of the fetus. It is typically measured in centimeters from the top of the mother's uterus to the pubic bone and should correspond with the number of weeks of gestation, ± 2 weeks. During the third trimester of pregnancy, significant fetal growth occurs. The fetus can grow to weigh 3 to 4 kg (6½-8½ lbs) and measures about 50 cm (19-20 inches) in length; organ development continues until birth, with some systems, like the nervous system and liver, developing further post-birth. By the 38th week, the fetus is fully developed and ready for birth. The fetus's size at this stage is typically between 36 to 51 centimeters (14-20 inches) in length and weighs between 2.7 and 4.6 kilograms (approximately 6-10 pounds). During this final stage of pregnancy, mothers may feel their most discomfort due to the baby's size and the physical changes occurring in preparation for labor and delivery.