Development of Human Baby (Links)

The Merck Manuals: Stages of Development
A baby goes through several stages of development, beginning as a fertilized egg. The egg develops into a blastocyst, an embryo, then a fetus.
http://www.merck.com/mmhe/sec22/ch257/ch257c.html

Mayo Clinic: Pregnancy Week by Week
First trimester

The first few months of pregnancy — the first trimester — are marked by rapid changes for both you and your baby.

For you, first trimester physical changes may include breast tenderness, fatigue and nausea. Your emotions may range from excitement to anxiety. For your baby, the first trimester is a time of rapid growth and development. Your baby's brain, spinal cord and other organs begin to form, and your baby's heart begins to beat. Your baby's fingers and toes even begin to take shape.
http://www.mayoclinic.com/health/pregnancy-week-by-week/MY00331

WebMD: Slideshow: Fetal Development Month-by-Month
Fetal Growth: Conception to Birth
You're pregnant. Congratulations! You are curious how big your developing baby is, what your baby looks like as it grows inside you, and when you'll feel it move, right? Take a peek inside the womb to see how a fetus develops from month to month.
http://www.webmd.com/baby/slideshow-fetal-development

Medline Plus: Fetal Development
Weeks 9 to 12 The baby can make a fist with its fingers.
Weeks 13 to 16
# More muscle tissue and bones have developed, and the bones become harder.
# The baby begins to make active movements.
Weeks 17 to 19
# The baby can hear.
# The baby makes more movements.
Week 20
# The baby is more active with increased muscle development.
# The mother can feel the baby moving.
http://www.nlm.nih.gov/medlineplus/ency/article/002398.htm

Biology Online: Growth and Development of a Human Baby
Upon arrival in the uterus, the zygote fuses itself to the uterine wall. At this point, cells of the zygote differentiate into two distinct types
* Embryoblast Cells - These cells continually divide into what will become the embryo, the baby itself
* Trophoblast Cells - These cells form the placenta, that form against the uterine wall
http://www.biology-online.org/7/2_embryo.htm

IUPUI Human Reproduction and Development Notes
Week 9- Week 40 (Fetus)
After 12 weeks or so, the baby's development is largely "finished" - except brain and lung development
The fetus just spends much of the 2nd and 3rd trimesters just growing (and doing various flip-turns and kicks inside the amniotic fluid)
http://www.biology.iupui.edu/biocourses/n100/2k4ch39repronotes.html

The Visible Embryo
The Visible Embryo is a visual guide through fetal development from fertilization through pregnancy to birth. As the most profound physiologic changes occur in the "first trimester" of pregnancy, these Carnegie stages are given prominence on the birth spiral.
http://www.visembryo.com/baby/index.html

CDC: Having a Healthy Pregnancy
Not all birth defects can be prevented, but a woman can take some actions that increase her chance of having a healthy baby. Many birth defects happen very early in pregnancy, sometimes before a woman even knows she is pregnant. Remember that about half of all pregnancies are unplanned.
http://www.cdc.gov/ncbddd/bd/abc.htm

Medline Plus: Bringing in Baby
Early, regular prenatal healthcare is a must for mothers and babies during pregnancy. Mom (and dad!) get to discuss all the important issues with their health care providers, from nutrition and what to expect during birth, to basic skills for caring for your newborn.
http://www.nlm.nih.gov/medlineplus/magazine/issues/winter09/articles/winter09pg3-4.html