1st day: The first cell divides in to two, then two into four and so
5-9 days: Sex of the baby can now be determined.
14 days: Mother's menstral period is now surpressed by hormone made by unborn baby.
18 days: Heart is forming; eyes developing.
20 days: Foundations of brain, spinal cord and nervous system is laid.
24 days: Heart begins to beat.
28 days: Muscles are developing along the future spine. Arms and legs begin to grow.
30 days: Child has grown 10,000 times to 6-7mm. Brain has human proportions. Blood flows in veins but is separate from mothers blood.
35 days: Pituitary gland in brain is forming. Mouth, ears and nose begin to take shape.
40 days: Heart's energy output is 20% of adults.
42 Days: Skeleton is formed. Brain coordinates movements of muscles and organs. Reflex responses have begun. 43 days: Brain waves can be recorded.
45 days: Spontaneous movements have begun. Buds of milk teeth have appeared.
7 weeks: Lips are sensitive to touch. Ears may resemble family pattern.
8 weeks: Child is well proportioned, small scale baby, 3cm, sitting up and weighs a gram. Every organ is present. Heart beats sturdily. Stomach produces digestive juices. Liver makes blood cells. Kidneys begin to function. Taste buds are forming.
9 weeks: Child will bend fingers around an object, placed in the palm. Thumb sucking occurs. Fingernails are forming.
10 weeks: Body is sensitive to touch. Child squints, swallows and frowns.
11 weeks: Baby urinates, makes complex facial expressions- even smiles.
12 weeks: Vigorous activity shows distinct indiviuality. Child can kick, make a fist, turn feet, curl and fan toes, move thumbs, turn head, open mouth and press lips tightly together. Breathing is practiced.
13 weeks: Face is prettier, facial expressions resembles parents'. Movements are graceful. Vocal chords are formed. Sex organs are apparent.
4 months: Child can grasp with hands, swim and turn somersaults.
4-5 months: Mother senses movements.
5 months: Sleeping habits appear. Child responds to sound in frequencies to high or to low for adults to hear.
6 months: Fine hair grows on eyebrows and head. Eyelash fringe appears. Weight is about 640g.(1lb 6oz) and height 23cm.(9in).Babies born at this age have survived.
7 months: Eye teeth are present. Eyelids open and close, eyes look around. Hands grip strongly. Mother's voice is recognized.
8 months: Weight increases by 1kg (over 2lbs) and baby's quarters get cramped.
9 months: Child triggers labour and birth occurs, usually 255-275 days after conception. Of 45 generations of cell divisions before adulthood, 41 have already taken place.