asocial stage- 0-8weeks old, baby’s behaviour between objects and humans are similar, they’re happier in the presence of humans and will simile at anyone
Indiscriminate stage- 2-7months, babies are able to distinguish between familiar and unfamiliar faces and will simile at more familiar people, They don’t usually show stranger or separation anxiety
specific attachment stage- 7-12months, primary attachment to 1 individual has formed, starting to show stranger and separation anxiety , uses familiar adults for secure base behaviour
multiple attachments- 12months onwards, forming secondary attachments with familiar adults which whom they send a lot of time with
Schaffers stages are based off of a longitudinal study with 60 babies from working class families in Glasgow where mothers were asked to record their babies behaviour
Schaffers study has high external validity as observations were made by parents, meaning babies would have acted normally as opposed to being distressed when being observed by a researcher - however, mothers could have been biased