For the administration of the instrument, one researcher intensively
studied the manual and retrospectively calculated the intra-research
agreement index, which was 81.6%. All infants (the experimental and
control group) were assessed in a single assessment, always by the
same investigator. In subdomain 5, all infants were evaluated by their
mothers. With this procedure, we seek to avoid anxiety and crying of
infants, and to standardize the management.