Week 3
Your third week of pregnancy is technically your first gestation week after conception. At this stage, your baby is a developing ball of cells called a blastocyst and is making its way through the fallopian tube to the uterine cavity where it will continue to grow and develop for the next 37 weeks.
Baby size : less than .1 inch
Baby weight : less than .04 oz
Week 4
The blastocyst is now officially considered an embryo and is busy implanting into the lining of your uterus where the placenta will continue to develop.
Baby size : less than .1inch, like a poppyseed
Baby weight : less than .04 oz
Week 5
At this stage your embryo is dividing into three layer of cells. The top layer will eventually become the central nervous system : the brain, spinal cord, spinal nerves and the backbone. The middle layer will develop into circulatory system and the bottom layer is where the lungs, intestines, thyroid and other major internal organs will develop.
Baby size : .13 inch, like an appleseed
Baby weight : less than .04 oz
Week 6
Your baby is rapidly growing and will triple in size this week. Basic facial features such as eyes, and ears are becoming more develop and the neural groove will have closed by this time. The tiny heart is starting to pump blood. Along the midline, 40 tiny blocks of tissue are developing which will eventually become the backbone, ribs and muscles of you baby`s back and sides.
Baby size : .25 inch, like a small pea
Baby weight : less than .04 oz
Week 7
This week your baby`s brain is becoming more complex and is developing cavities and passages vital for circulating spinal fluid. Your baby`s face is also becoming more defined with the lenses of the eyes and middle part of the ear forming. Tiny arms, legs, hands and feet are also beginning to bud.
Baby size : .51 inch, like a blueberry
Baby weight : less than .04 oz
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