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and most of the observation was done by who?

during?

meaning behaviour of babies unlikely to be affected by what?

excellent chance babies behaved how while being observed?

therefore we can say study has good/

:) longitudinal study

what does it mean that this was carried out longitudinally?

what would the quicker alternative have been?

what type of design would that be?

however longitudinal designs have better what kind of validity than cross-sectional?