Prenatal Development: Week 7
It's now four weeks after conception and your baby is about the size of a grain of rice. Your baby is only between 0.2 to 0.52 inches (5 to 13 millimeters) in length and about 0.03 ounces (0.8 grams) in weight. The arms and legs continue to grow, although fingers and toes haven't quite started to form just yet.
The Beginning of Something Great
The lenses of the eyes, nostrils, intestines, pancreas and bronchi are all now developing. Your baby's face is also starting to take shape; the mouth perforation, ear indentations, miniature nostrils and the pigmentation in the irises of the eyes are all happening this week.
In addition, the umbilical cord, which gives nourishment and disposes of the baby's wastes, develops from the implantation site of the blastocyst. The baby's digestive tract and lungs are also continuing to form.
Expecting Twins? Even though you are only seven weeks pregnant, it is still possible to tell whether or not you're having twins. If you are pregnant with twins, some of the early signs of pregnancy are:
- Faster rate of weight gain - women carrying twins can gain ten pounds in their first trimester!
- Greater tendency to retain water
- Increased fatigue
- Morning sickness that is often more severe than that experienced by women carying one baby.
Around this time you'll develop a mucous plug, which forms in the opening of the cervical canal and seals off the uterus to protect your growing child. Eventually you'll lose this plug as your cervix dilates in preparation for labor.
Select a week of development to read detailed information:
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