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MayoClinic.com Fetal development begins before you even know you're pregnant. Here's a calendar of events.
www.mayoclinic.com/health/prenatal-care/PR00112
Upside: Superb summary of fetal development by week
Downside: Links to 2nd and 3rd trimester at bottom of page
MayoClinic.com Fetal development progresses rapidly in the second trimester. Check out the weekly changes.
www.mayoclinic.com/health/fetal-development/PR00113
Upside: Superb summary of fetal development by week
Downside: Links to 1st and 3rd trimester at bottom of page
Fetal development is an amazing process. Learn everything about your growing baby and what's going on inside your body during those nine months.
www.babyzone.com/pregnancy/fetal_development-index
Upside: Many articles to track fetal development
Downside: Many ads
Based on the presentations given by well-known specialists at a recent multidisciplinary conference of developmental psychobiologists, obstetricians, and physiologists, this book is the first ...
www.amazon.com/Fetal-Development-Psychobiological-Jean-Pierre-Lecanuet/dp/080581485X
Upside: Site selling book on fetal development
Downside: Limited number of customer reviews
Checking on fetal heart-rate patterns can offer insight into how a child's nervous system will develop through its toddler years, a U.S. study finds.
www.babycenter.com/204_fetal-heart-rate-offers-clues-to-child-development_5224735.bc
Upside: News article on tracking your baby's fetal heart rate during pregnancy
Downside: Busy page
Watch your baby grow through pregnancy with an amazing collection of pictures, video, sound clips, ultrasounds and more. Step by step see your baby develop to birth.
Upside: Links to various pages with different types of fetal development details; several pictures
Downside: Cluttered page; hard to know exactly what to expect
WEEK BY WEEK CHANGES The following list describes specific changes that occur in the womb:* Week 3 of gestation
www.nlm.nih.gov/medlineplus/ency/article/002398.htm
Upside: Illustrations and descriptions about the development of the fetus through its various stages.
Downside: Lots of scrolling - pictures at top.
The development of a baby is quite an intricate journey. From the moment that the egg and sperm meet, a baby is beginning the development process. This early part of development lays the ground work ...
www.americanpregnancy.org/duringpregnancy/concernsearlydevelopment.htm
Upside: Very good overview of different potential concerns at different times in early pregnancy with guidelines on what to expect
Downside: None
From early on in pregnancy, babies grow at different rates, so these numbers are merely averages. Your baby's actual length and weight may vary substantially. Don't worry too much if an ultrasound ...
www.babycenter.com/average-fetal-length-weight-chart
Upside: Detailed chart of fetal length and weights
Downside: Click on 'See all on one page' to reduce clicking
The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation.
en.wikipedia.org/wiki/Yolk_sac
Upside: Excellent user-compiled detail on the yolk sac including excellent graphics
Downside: None