Across the mammalian spectrum a one-teat preference is recorded. In the human mammal this may be a vestigial behavioural remnant and be most evident following maternal nipple deprivation when the baby fixatedly sucks on only one digit out of ten to the exclusion of all others. Also seen is the newborn having a pre-birth fixation on the thumb, finger or wrist, (buccal Merkel cells proliferate from 9th gestational week) resulting in the baby initially rejecting the mother’s nipple and suckling area in preference to the already-found and imprinted object upon which it has formed an emotional (latchment) relationship (see slides 10-20).