And a baby's brain is plastic, able to reprogram one area to substitute for another.
Imaging technology has confirmed that this kind of play activates the pleasure center in the baby's brain, whereas engaging in a mismatched activity doesn't.
Several previous studies have shown that eating fish during pregnancy helped in the baby's brain development and in reducing the risk of post-partum depression.
It can cause miscarriage or damage the baby's brain or eyesight.
New laboratory technology is enabling scientists to see more clearly what is going on inside a baby's brain and monitor how it interacts with its environment.
Obviously, when a baby dies of unexplained brain bleeding, abuse has to be at least considered.
"There was not anything more extraordinarily complex about these issues, as to the extent of injuries, than in many other brain damage baby cases, a field of specialization that this attorney is particularly expert at, " Judge Schlesinger wrote.
The technology allows researchers to measure magnetic-field changes around the brain while a baby sits under what looks like a beauty-salon hair dryer.
However, expert witness Dr Jean Keeling told the hearing on Wednesday that damage to the baby's heart, brain and lungs was evidence of a lack of oxygen caused by interference with his breathing.
BBC: NEWS | UK | Northern Ireland | Baby 'was starved of oxygen'
And in pregnant women it can result in the baby being born blind or with brain damage.
In some cases, this may cause the baby to be born with a brain defect such as cerebral palsy.
The infection can stop a baby breathing or lead to pneumonia, brain damage, weight loss and death.
Researchers implant a small sensor -- about the size of a baby aspirin -- in the motor area of the brain.
Spielmann says omega-3 and omega-6 fatty acids are essential for optimal brain development, the best sources for the baby being breast milk or whole milk.
It consisted of a 100-electrode panel about the size of a baby aspirin that was placed on the surface of the brain at a fold in the motor cortex where hand movement is controlled.
Even though the brain is not fully developed at birth, the baby has to come out while the head is still small enough to get through the cervix.
Helena's group also interviewed a teacher about a baby who was born two days after her mother died from a brain haemorrhage.
Such bleeding may deprive the baby of oxygen - a condition known as fetal hypoxia - and this is turn impacts upon the developing brain, potentially raising the risk of autism.
According to Bazelon, there many other possible causes of brain bleeding, few of which have been carefully explored by the medication profession fixated on the shaken baby diagnosis.
There is a deep yearning for a baby that came out of nowhere and does not match up with the practical thoughts that are coming out of my brain.
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