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absorb the movements that match basic sounds

first birthdays, babies start shifting back to look you in the eye again

University of Iowa psychology professor Bob McMurray, who also studies speech development.

quality face-time with your tot is very important for speech development – more than, say, turning on the latest baby DVD.

Other studies have shown that babies who are best at distinguishing between vowel sounds like "ah" and "ee" shortly before their first birthday wind up with better vocabularies and pre-reading skills by kindergarten.

babies also look to speakers' faces for important social cues about what they're hearing

So he and doctoral student Amy Hansen-Tift tested nearly 180 babies, groups of them at ages 4, 6, 8, 10 and 12 months. How? They showed videos of a woman speaking in English or Spanish to babies of English speakers. A gadget mounted on a soft headband tracked where each baby was focusing his or her gaze and for how long.

They found a dramatic shift in attention: When the speaker used English, the 4-month-olds gazed mostly into her eyes. The 6-month-olds spent equal amounts of time looking at the eyes and the mouth. The 8- and 10-month-olds studied mostly the mouth.

At 12 months, attention started shifting back toward the speaker's eyes.

at 6 months, babies begin observing lip movement, Lewkowicz says, because that's about the time babies' brains gain the ability to control their attention rather than automatically look toward noise.

Duke University cognitive neuroscientist Greg Appelbaum

children do think before they speak.

C-section babies have a pattern of "at risk" microorganisms in their gastrointestinal tract that may make them more susceptible to developing the antibody Immunoglobulin E, or IgE,

Children born to teenage parents are more likely to lack proper prenatal care

also more likely to be born prematurely, have low birth weight, or become hospitalized during their childhood than children born to adults, states the March of Dimes. The same source says that babies of teenage mothers are more likely to die during their first year of life

the children of teenage mothers are more likely to drop out of high school, or become unemployed than the children of older women. They experience abuse and neglect quite often, and many of them become parents as teenagers.

ested the learning abilities of sleeping newborns by repeating tones that were followed by a gentle puff of air to the eyelids.

After about 20 minutes, 24 of the 26 babies squeezed their eyelids together when the tone was sounded without the puff of air.

The brain waves of the 24 infants were found to change, providing a neural measurement of memory updating.

While past studies find this type of learning can occur in infants who are awake, this is the first study to document it in their most frequent state, while they are asleep

Learned eyelid movement reflects the normal functioning of the circuitry in the cerebellum, a neural structure at the base of the brain. This study's method potentially offers a unique non-invasive tool for early identification of infants with atypical cerebellar structure, who are potentially at risk for a range of developmental disorders, including autism and dyslexia, she said.

Newborn infants' sleep patterns are quite different than those of older children or adults in that they show more active sleep where heart and breathing rates are very changeable," she said. "It may be this sleep state is more amenable to experiencing the world in a way that facilitates learning."

Another factor is that infants' brains have greater neural plasticity, which is the ability for the neural connections to be changed