The move to targeted examinations at ages 2 and 3.5 years, rather than routine, has raised concerns that some
conditions (eg, pervasive developmental disorder) may be missed.
[3] No developmental screening tool can allow
for the dynamic nature of child development. Achild's performance on one particular day is influenced by many
factors. Development is not a linear process - it is characterised by spurts, plateaux and, sometimes
regressions.