Title: Fetal development: MedlinePlus Medical Encyclopedia
Headings: Fetal development
Fetal development
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Content: Your baby begins to store fat. Week 26
Eyebrows and eyelashes are well-formed. All parts of baby's eyes are developed. Your baby may startle in response to loud noises. Footprints and fingerprints are forming. Air sacs form in baby's lungs, but lungs are still not ready to work outside the womb. Weeks 27 to 30
Baby's brain grows rapidly. The nervous system is developed enough to control some body functions. Your baby's eyelids can open and close. The respiratory system, while immature, produces surfactant.