Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
This graph depicts the typical changes in the embryonic/fetal heart rate in relation to the gestational as well as post-fertilization age as recorded by ultrasonographic measurements during all periods of pregnancy. Note that after the first trimester, there is only a slow linear decrease in the heart rate up to the birth of the baby. Based on data from [41,42]. Abbreviations: bpm = beats per minute; Gest. = Gestational; Post-fert. = Post-fertilization.
