Problem: During pregnancy, doctors take many measurements to make sure the baby is growing well. In the second and third trimesters, one of the most important measurements is the baby's growth inside the womb. In the second trimester (weeks 13 to 26), a key measurement is the fetal anatomy scan, usually done around week 20. This ultrasound looks at the baby's whole body. Doctors check the baby's head, brain, heart, spine, stomach, kidneys, and limbs. They measure the size of the head (called biparietal diameter) and the length of the thigh bone (femur length). These help to know if the baby is growing normally. In the third trimester (week 27 to birth), one of the most important things is the baby's weight and position. Another key measurement is the fundal height, which is the distance from the top of the mother's belly to the pubic bone. This helps to guess the baby's size and growth. If the baby is too small or too big, doctors may do more tests. Also, amniotic fluid levels are measured. This fluid surrounds the baby and helps protect it. Too much or too little fluid can be a sign of a problem. These measurements help doctors. Need Assignment Help?