Baby is the size of a brussels sprout. Baby is very active, but you won’t be able to feel its movement yet.
Baby is about 2 to 2 1/2 inches from crown to rump and the average fetus weighs just about 0.33 ounce. Half of baby’s length is its head.
Baby’s facial features are maturing. Ears are moving toward their final position on the sides of the head. Eyes are set wide apart, and the eyelids are fused shut. Tiny teeth buds are developing.
Baby’s external genitalia are forming, but it will be awhile before you can tell if it is a boy or girl.
The placenta is growing as the baby’s rapid growth needs more nutrients. Baby’s red cell count will increase quickly as well.
Pregnancy Week 11
Baby is about the size of a strawberry, measuring about one inch from crown to rump.
Baby’s head is taking on a rounder, more human shape.
All the internal organs are in place and starting to work together.
Baby’s eyes, eyelids, and ears are continuing to develop. Tiny tooth buds have begun to develop.
Fingers and toes are growing longer, and the webbing between fingers and toes is disappearing.
At 9 weeks, your baby is the size of a cherry! Baby measures 0.6 to 0.7 inches long and weighs about 0.12 ounces.
Baby is no longer considered an embryo – he or she is now known as a fetus and looks more like a little baby.
Facial features continue to develop – a more prominent nose and eyelids. The head is large compared to the body. Baby’s toes are now visible.
Internal organs are also forming, including the digestive and reproductive systems. Intestines and testes or ovaries are growing.
Baby may be starting to move, but baby is a bit too small to feel these movements.
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The egg is fertilized and cellular development begins immediately. The gender of the baby can be determined before the egg is implanted in the womb.
When the new life implants, it is already composed of hundreds of cells. It has developed a protective hormone to prevent its rejection as foreign tissue in the mother’s body.
At 17 days blood cells have developed.
At 18 days the muscle that will become the heat begins to pulsate.
At 19 days the eyes begin to develop.
At 20 days, the foundation of the brain, spinal cord and e
ntire nervous system has been laid.
At 21 days the heart begins to beat.
At 28 days the backbone and 40 pairs of muscles are developing along the trunk. Arms and legs are forming.
Photo credit: http://www.babycenter.com/fetal-development-images-4-weeks