Researchers from Norway and Canada used data from The Norwegian Mother and Child Cohort Study (MoBa) and The Medical Birth Registry of Norway to measure the effect of SSRIs and maternal depression on birth weight and gestational length, using
their sibling design method to differentiate the study from previous studies looking into prenatal SSRI effects.
Similarly, longitudinal and mixed -
methods designs could examine whether such relationship characteristics or changes are detrimental to or foster long - term
sibling adjustment.