Fetal cardiomegaly (heart enlargement) is determined by looking at the ratio
of the
fetal heart circumference to the
fetal chest circumference. When is
baby is
of such advanced gestational age as 37 - 38 weeks, the baby is already large and it's position in the uterus may make it hard to see body structures at the best angle to make these measurements. If you are looking at something from an odd angle, it might look large (or small). So there is a good chance that this is not accurate.