The pair are just six weeks old

By Alex Heigl
Updated April 12, 2016 12:50 PM

The bond that twins develop in the womb play out after they’re born. And this video – from YouTuber “Twin Mom” – is just the latest evidence of that.

In the clip, which appears to have been filmed from a baby monitor, the six-week-old boy starts crying, and his sister reaches over and places her thumb in his mouth to comfort him.

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It looks like it does the trick; at the end of the video, the little guy has started to fall asleep.

It looks like sis is establishing a tradition that’s going to continue throughout the pair’s life.