Since conception, 46 chromosomes have been combined with 30,000 genes, determining all physical characteristics: sex, characteristics of face and body, color of eyes, hair and skin. And even more amazing, intelligence and personality - the way the baby thinks and feels - are already placed in his genetic code. At the time of conception an "he" appeared essentially and uniquely.
While still in the womb, the baby begins to move, swallow and "breathe" the amniotic fluid, respond to stimuli and generally prepare for the life outside.
The heart begins to beat
Since the heart begins to beat, at 18 days, the baby's blood passes along the umbilical cord, passes through the placenta and approaches the maternal blood vessels in the uterus.
Through the partition wall there is the exchange of gaseous loads: the child passes the mother the carbon dioxide residues, and she provides oxygen and nutrients.
Respond to the touch
The child has become sensitive and responds to touch. All five important sections of the brain are present. Brain functioning measured on the basis of EEG waves is recorded at 40 days. Here the wonderful control center sends messages to the mother and the baby.
The head occupies almost a third of the total body volume, but will become proportional to the rest of the body as the child grows.
Where's the baby
The child lives inside a transparent membrane called an amniotic sac. The bag is filled with a salty solution that surrounds the cells of the body.
In a complex process, the body recycles the liquid by swallowing one part, another absorbing it, another eliminating it, at the same time producing most of it. The embryo floats in the fluid being protected from shocks and not having to resist gravity.
From now on he has hands and feet
The hands begin to form at about 3 weeks and the fingers at 6 weeks. The face can clench its fingers and open its mouth in response to the pressure applied to the base of the thumb. At first when he touches his mouth with his hands, he turns his head with his mouth open. He can later turn his head to his hands and put his fingers in his mouth to suck them.
The nails are present at 7 months. The legs develop a little later than the hands. At about 9 weeks, in response to reaching the soles of the foot will bend his fingers or bend his knees to move away from the object. From 2 months, the fingerprints are already imprinted in the skin. The child begins to make slow movements, sudden or slow and rhythmic strokes.
Sound and sight
The baby is surrounded by a loud noise such as his mother's heartbeat or loud music. It responds to sounds in frequencies so high or low that they cannot be heard by the adult ear, suggesting that sensory channels other than those of the ear are involved. It responds to different sounds such as his mother's voice and is tuned to the rhythm of his mother's life - often asleep and waking up with it. The muscles in the orbit of the eye are present quite early, its eyes rotating with the movement of the position and during sleep. Light penetrates through the uterine wall and the amygdala fluid, and its activity increases in response to intense light. The eyelashes remain closed until the 7th month to protect the eyes. The intermittent alternation of light calms the face.
The baby begins to make spontaneous movements at about 7 weeks, but the mother usually does not feel the baby moving until about 16 weeks. At 11 weeks the child swallows amniotic fluid and passes it back through the urine.
It can also produce complex facial expressions and even smiles. At 18 weeks he is active and energetic and performs numerous flexions of the muscles. It can give impressive punches and hits by countries.