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When I talk about my fussy baby, many people tell me half-jokingly that fussy babies are on average more intelligent than "easy" babies. The idea is not unusual. See for example here:

In fact, scientists have found fairly convincing evidence that fussy babies tend to be more alert, intelligent, passionate, intuitive and empathetic than content babies.

Sadly, the above claim came without direct reference!

Is there "fairly convincing evidence that fussy babies tend to be more [..] intelligent"?

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    I know that the site you cited links to a paper which isn't convincing evidence. However, just because that paper isn't convincing evidence doesn't mean that there isn't convincing evidence. I don't have a better answer than the existing one. However (my opinion), your accepting that (inconclusive) answer will discourage any potential answerers from answering. – Barry Harrison Jul 31 at 22:22
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It does not seem so.

The link at the bottom of the article points to this article by Schmidt, Fox, Perez-Edgar and Hamer.

My (non-expert) reading of this is that baby fussiness is largely genetically determined, but that certain environmental factors also play significant roles.

We found evidence of a gene-endoenvironment interaction in predicting two components of temperament in a sample of typically developing children.

Of course, this is not sufficient evidence to claim that intelligence and fussiness covary; merely that fussiness is to some degree inherited. Of course, intelligence is to a large measure inherited, too, but no link is drawn between the two.

An article at this link suggests that a probable test for early giftedness is whether babies easily habituate to new stimulus, which could mean that they can absorb and retain sensory information better. My reading is that the study is very cautious not to make any firm claims about infant intelligence being identifiable by common heuristics.

I found there are many supposed signs of superior intelligence on baby-advice sites (see for instance this link) most of which are some form of folk-wisdom. For instance, the claim that smarter babies do not sleep well has been problematised many times over. E.g. Here.

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    "Having a hard time with your kid? Well, they're smarter that way." – Cullub Jul 31 at 22:12

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