On metadata for infant studies, this is the list we've compiled based on input from 3 labs + literature review trends:

Generally agreed/coded/reported:
- broad infant population type: "standard" (for lack of a better word; this is fullterm, no neurological, language, health problems, etc etc etc); otherwise specify. From 76 articles or theses published in English until June 2012, reporting results from 3557 infants, only 13% of infants were not "standard", so it's unclear how many and which categories we'd like to create. Perhaps it's simpler for now to just write his/her characteristics out.

- state: awake asleep other  (ideally, we'd keep more specific track of state, but this is not often done/practical)

- circumference (cm)

- ear-to-ear-vertex (cm)

- ear-to-ear-inion (cm)

- nasion-inion (cm)

Other variables suggested:
Sex: male female (cf. arguments in EEG of sex differences in infancy)

Studies on lateralization, handedness: mother, father, child (left, right, ambi)

For newborns and premature infants:  Gestational age at birth (days); Birth (VB, C); Anesthetic (no, name)

Hair: 1-3 quantity, 1-3 thickness, 1-3 darkness  (potential problem: cross-lab differences in coding when seeing the same exact picture)

Skin: (no agreement on how to code this, none of the labs really keeping track of this)