title: The early developmental context of twinship: some limitations of the equal environments hypothesis.
abstract: Using questionnaires distributed to mothers, the characteristics of early development in twinship were investigated. Results indicated twinship to be an at-risk situation with neonatal complications and within-pair differences in the attainment of developmental milestones. The implications of these differences raise questions about the accuracy of the equal environments hypothesis.
mesh_terms: D001724:Birth Weight; D002657:Child Development; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000523:psychology; D009048:Motor Skills; D011247:Pregnancy; D011248:Pregnancy Complications / Q000523:psychology; D012306:Risk; D012931:Social Environment; D014427:Twins / Q000523:psychology*; D014429:Twins, Dizygotic / Q000523:psychology*; D014430:Twins, Monozygotic / Q000523:psychology*