Picture and Explanation of How Your Baby is Growing and Developing at 28 Weeks Pregnant



picture 28 weeks pregnant
view larger picture of 28 weeks pregnant diagramview larger picture
28 weeks pregnant picture

Source: The Growing Uterus Charts
© 1989, 2006 Childbirth Connection
By your 28th week of pregnancy, your baby is about 16 inches long and weighs between two and three pounds. The skin is wrinkled but will become less so as more subcutaneous fat, the layer of fat just under the skin, is laid down in the next few weeks. Fine downy hair, called lanugo, and a waxy white protective substance covering the skin, called vernix, are present on the baby's body. The baby's eyes are open. The eyebrows and eyelashes were formed in the fourth month. The baby sucks its thumb and its taste buds have developed. The baby kicks, stretches, and moves frequently in the uterus. These movements, which are readily observable to others, are often keenly felt by the mother. Some mothers may find that the pressure of the growing uterus against the stomach by this week causes heartburn. The fundus, the top of the uterus, is now about one-third of the distance between the umbilicus (bellybutton) and the xiphoid cartilage. Constipation may also occur due to uterine pressure on the lower colon, as well as hormonal slowing of peristalsis (the process of excreting waste). Uterine growth combined with increased maternal weight gain contribute to a recurrence of fatigue similar to that during the early weeks of pregnancy.


By the 28th week, changes in the breasts prepare them for lactation. First colostrum, then milk, is produced by the grape-like clusters of tiny sacs (alveoli) deep within the breast tissue. Clusters of alveoli form lobules, which consolidate to form 15 to 20 lobes. Each lobe connects to a lactiferous duct. As the ducts extend toward the nipple and areolar areas, they widen into the lactiferous sinuses. These sinuses (or milk pools) release the milk through 15 to 20 tiny nipple openings when the baby nurses.

The baby's organs and systems are quite well developed by the 28th week of pregnancy. If born now, the baby would probably survive but would need intensive, specialized care. The final two months of gestation are important for further maturation of all body systems and organs. Full term gestation best prepares the baby for a smooth and healthy adjustment to life outside of your uterus.




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Most recent page update: 6/4/2013


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