#babyheart #babyheartbeat At 6 weeks of pregnancy, which is approximately 1.5 months gestational age, the process of organogenesis is well underway. By this time, many of the major organs as baby heart have started to form. Here are some key developments: • At 6 weeks Mesoderm cells of embryo started to form a bunch of cells after differentiation and these cells form baby heart Neural Tube: