Accurate measurement of infant head circumference requires a simple but accurate tool, that is, a non-stretchable, plasticized measuring tape. It is suggested that the tape be 1/4 - 1/2 inch wide. Ideally an insertion tape is used, since it provides a more accurate view of the circumference measure than that obtained by overlapping the edges of a tape measure. The tape should have 0.1 cm increments.
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