prenatal By milazkay Mar 9, 2016 Gastrolation Cells form layers Mar 9, 2016 Cells multiply Mar 9, 2016 Heart begins to beat Usually 18 days after conception Mar 9, 2016 Brain Developes Mar 9, 2016 Placenta Filters blood Mar 9, 2016 5/6 months Responds to light Mar 9, 2016 Last trimester Fetus grows Mar 9, 2016 Brain loves fat