Harlow did a famous study that related to mother/baby physical contact
[Here’s a super condensed explanation of it and why it’s important](https://youtu.be/RC0L_llyAz4?si=uJR-bn4XQlV4tCP-)
There’s more videos that go further into it but surprise/TW, experiments during this time weren’t super ethical so although experiments like this would never happen today, it laid the groundwork for modern research into developmental psychology
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