An improved infant/neonatal pulse oximeter sensor substrate which is preferably conforming to the shape of the infant or neonate's foot. In one embodiment, the pad (10) conforms to the heel of the infant, with the emitter (14) and detector (20) preferably being mounted in the region of the calcaneus bone (26). The heel pad can be held in place with a stretchable sock (52). In an alternate embodiment, the conformable pad is a sock (52) with recesses or pockets (54, 56) cut in it for holding the emitter (14) and detector (20).
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