Method and apparatus are provided for generating an index associated with non-nutritive suck pattern stability. An example apparatus can include an STI generator configured to generate a plurality of non-nutritive suck (NNS) pressure samples using a non-nutritive pacifier and a pressure transducer, and to sum a plurality of standard deviations based on the plurality of NNS pressure samples to provide a spatiotemporal index (STI) of non-nutritive suck pattern stability, wherein the STI is configured to provide a composite indication of variability of amplitude, and duration of a plurality of portions of the NNS pressure samples.