Identify the trimester when each fetal development finding occurs.

Finding 1st Trimester Conception-13 weeks 2nd Trimester 14-26 weeks 3rd Trimester 27-40 weeks Formation of fingers, toes, and facial features ✅ Fetus can hear and respond to external stimuli ✅ Gender can be determined ✅ Increase in body fat reserves ✅ Brain develops most rapidly during this time ✅ Fetus has a heartbeat ✅ 1st Trimester: The embryo forms major structures, including fingers, toes, and facial features. The fetal heart begins to beat by around 5-6 weeks gestation, detectable by ultrasound. 2nd Trimester: The fetus can hear and respond to external sounds around 18-25 weeks. Gender determination is possible via ultrasound by 16-20 weeks. 3rd Trimester: The fetus begins storing fat to prepare for birth. The brain develops most rapidly in the last trimester, especially in the last 6 weeks, supporting cognitive and neurological function.