-
Period: to
week 1-2
none -
Period: to
week 3-4
- conception -zygote turns into blastocyst and travels down the fallopian tube
- rapid cell division begins
- blastocyst implants in uterus lining during week 4 and becomes and embryo
-
week 5-6
-neural tube closes; brain and spinal cord will form
- heart, organs and bones start to form
- develop head and trunk
- arm and leg limb buds appear
- brain begins development
- eyes and ears begin to form
- heart continues to develop, and beats a regular rhythm
- baby is 1/6 inch long -
week 7-8
- brain and face shape begin growing
- four-chamber heart
- lungs begin to form
- fingers and toes start to form
- ear begins to develop internally
- lip and nose have formed
- trunk and neck begin to straighten
- baby is about 1/2 inch long
- all major organs are formed
-
Period: to
week 10
- head is half the size of the baby
- all body parts are present
- eyes,ears,arms and legs are identifiable
- baby is 1 1/4 inches long
-
Period: to
week 11
- genitals develop
- head is about half of the length of baby -teeth buds form
- baby is about 2 inches in length and weights about 1/3 ounce
-
Period: to
week 12
- fingernails grow
- face has more defined profile
- intestines are in the abdomen
- about 2 1/2 inches in length and weighs about 1/2 ounce
-
Period: to
week 14
- babys sex will become apparent
- baby can swallow and make urine
- baby is about 3 1/2 inches in length and weighs about 1 1/2 ounces