Review Question - QID 109300

A 25-year-old woman comes to her obstetrician’s office for a prenatal visit. She has a transvaginal ultrasound that correlates with her last menstrual period and dates her pregnancy at 5 weeks of gestation (embryonic age is 2 weeks less than gestational age, thus 4 weeks). She has no complaints except some nausea during the morning that is improving. She comments that she has had some strange food cravings, but has no issues with eating a balanced diet. Her BMI is 23 kg/m^2 and she has gained 1 pound since the start of her pregnancy. She is curious about her pregnancy and asks the physician what her child is now able to do. Which of the following developments is expected of the fetus during this embryological phase?