The baby's head, minuscule though it is, will be detectable. The ectoderm will develop the skin, hair, glands, nervous system, and the lining of the nose, mouth, and ears. The mesoderm will form the muscles, bones, heart, blood, lungs, reproductive and excretory systems. The endoderm will build the lungs, tongue, glands, bladder, and digestive tract. She will be drinking lots of water since the next few weeks are critical to proper heart and nervous system development.
Early heartbeats are faint but audible.
Facial features start to form as well as tiny lungs. The spinal cord fuses and small arms start to grow. She may experience vaginal discharge, a rash, or itching. Remainder of body begins to grow. Lower limbs, digestive system, eyes, ears, and even tiny fingers present themselves.