First Trimester
- Week 2*
- Conception is the moment at which the sperm penetrates the ovum. Once fertilized it is called a zygote, until it reaches the uterus 3-4 days later.
- Week 4
- The embryo may float freely in the uterus for about 48 hours before implanting. Upon implantation, complex connections between the mother and embryo develop to form the placenta.
- Week 6
- The embryo is about 1/5 of an inch in length. A primitive heart is beating. Head, mouth, liver, and intestines begin to take shape.
- Week 10
- The embryo is now about 1 inch in length. Facial features, limbs, hands, feet, fingers, and toes become apparent. The nervous system is responsive and many of the internal organs begin to function.
- Week 14
- The fetus is now 3 inches long and weighs almost an ounce. The muscles begin to develop and sex organs form. Eyelids, fingernails, and toenails also form. The child’s spontaneous movements can be observed.
- Week 18
- The fetus is now about 5 inches long. The child blinks, grasps, and moves her mouth. Hair grows on the head and body.
- Week 22
- The fetus now weighs approximately 1/2 a pound and spans about 10 inches from head to toe. Sweat glands develop, and the external skin has turned from transparent to opaque.
- Week 26
- The fetus can now inhale, exhale and even cry. Eyes have completely formed, and the tongue has developed taste buds. Under intensive medical care the fetus has over a 50% chance of surviving outside the womb.
- Week 30
- The fetus is usually capable of living outside the womb and would be considered premature at birth.
- Week 40
- This marks the end of the normal gestational period. The child is now ready to live outside of his mother’s womb.
- **credits to http://www.wpclinic.org/parenting/fetal-development/ **
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