That is not an accurate summary. The article clearly discusses how they limited squirming enough to gather actual data.
A Very long time average, by the way. 8 minutes is a long time for a baby to stay at once: not squirming, not upset, not touching mother and awake.
i'll let you go ahead and explain how they controlled for squirming, I'm interested
You can find the answer in this link:
https://singularityhub.com/2025/03/20/new-baby-brain-scans-r...
They presumably don’t have any extra information except what’s in the article which said they “often squirmed” rather than always, which means simply repeating the process enough gives times when they didn’t.
If you want technique: “infants were _ to reduce movement.”
If you missed what was in the blank you might want to reread to see what else you missed.