 - TD children n144: Inclusion criteria will be GA and sex-matched compared to the CP group, with CA at assessment matched to the CP group at baseline 72 children and at the 7-month assessment 72 children. Exclusion criteria will be any motor or sensory impairment as defined by neurologic exam andor scaled motor scores below 8 for CA on the Bayley III and cognitive impairment or delays as described for the CP group. 