chapter  3
18 Pages

Detecting Infant Regression Periods: Weak Signals in a Noisy Environment

In 1992, van de Rijt-Plooij and Plooij reported observation and questionnaire/interview data indicating the existence of 10 regression periods in the first 17 months of life for full-term normal infants from intact families. These periods started at almost the same gestational age in all the infants studied.