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Sagittal dimensions of the anterior cranial base, maxilla and mandibular body in newborn male infants.

The linear dimensions of the anterior cranial base, the maxilla and the mandibular body were studied in 40 male infants, mean age 36 days.

The mean values were compared with the same parameters at later stages of development. They appeared to be atypical and not to have a Gaussian distribution.

It is suggested that before birth the skeletal structures are influenced by intrauterine epigenetic nutritional and metabolic factors. An unstable equilibrium of the so-called functional matrix could also be an influencing factor.