Week 15

• Your baby measures about 3.7 to 4.1 inches (about 9.3 to 10.3cm) from crown to rump and weighs about 1.75 ounces (50g).
• Your baby's bones still consist of soft cartilage but they are now beginning to harden and the development of the bones and the marrow continues.
• Her ears are developing into a more recognizable shape and any hair already on the head and brows will become thicker.
• Your baby may already be sucking her thumb.
• Her skin is thin and translucent and all her blood vessels can be seen through it.
• Her hair continues to grow on her head and her eyebrows. If her hair will be dark, the follicles will start to generate pigment to color her hair.
• Your baby is moving more now and is becoming increasingly flexible. She can bend her arms at the elbows and wrists and she can make tiny fists with her hands.