The slow development of fetal heartbeat and buds may be due to malnutrition, but it cannot be ruled out that it is due to other reasons such as insufficient corpus luteum function or poor embryo quality.
Poor nutrition in the early stages of pregnancy or malnutrition caused by severe vomiting may affect the development of the fetal heart and buds. If vomiting is severe, it can be relieved by eating smaller meals and, if necessary, treated under the guidance of a doctor.
The more common reason for slow development of fetal heart and fetal buds in early pregnancy is that they are late in implantation, so they do not match the gestational week and are mistakenly thought to be slow in development. If the corpus luteum is not functional enough, the embryo quality is not good may also appear slow development, or even stop developing.
It is important to maintain a balanced nutritional regimen after pregnancy, and to seek medical attention if you experience severe vomiting or if the fetus stops developing.