nourisson (1) famille (1) enfant (1) Economic conditions (1) Sons (1) Touch (1) Socioeconomic status (1) Social status (1) Sex (1) Parenthood (1) Mothers (1) Months (1) Infants (1) Impact (1) Fathers (1) Families (1) Daughters (1) Analysis of variance (1) Vocalization (1) Social conditions (1) Behavior (1) Family (1) nourrisson (1) père (1)