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The sentence in question: 店員さんに話を聞くと、「１０年ほど前から海外のだっこひもが人気となり需要が高まった。

For full context:
<https://www3.nhk.or.jp/news/web_tokushu/2018_0521.html?utm_int=news_contents_tokushu_004>

My attempt at tranlstion: When we asked the shopowner the story: "Since before
about 10 years, the foreign "dakko" cords have become popular and the demand
has risen."

Ive encountered the と particle in various uses about which my textbook has
never told me anything, and many of them meant something like "make A to B".
So this question is just for confirmation that I guessed correctly here :D
CC BY-SA 4.0
2018-05-24T13:14:30.887
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2018-05-24T13:52:11.960
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question
grammar particle-と
Does A が B となる　mean "A becomes B"?
You're right.

AがBとなる means "A becomes B". ～が～ **と** なる sounds less colloquial and a bit more
formal than ～が～ **に** なる.

> 海外のだっこひも **が** 人気 **となる**  
>  Baby slings/carriers from overseas become popular  
>  (≂ 海外の抱っこひもが人気になる)

You can think of 「AをBとする」 as its transitive counterpart: Intransitive
「AがBに/となる」(A becomes B) -- Transitive「AをBに/とする」(make A B; think of A as B)
CC BY-SA 4.0
2018-05-24T13:32:17.053
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2018-05-24T13:41:42.453
2018-05-24T13:41:42.453
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answer
Apparently `〜になる` and `〜となる` are pretty much equivalent (become ~), but there
is a small difference in nuance. If I understood [this Oshiete!
Goo](https://oshiete.goo.ne.jp/qa/3971946.html) answer correctly, `に` is used
for natural, obvious results and `と` when the development is sudden or
somewhat unexpected. This example was given:

> 「すったもんだの末、結局彼が村長 **となった** 。」
>
> After an awful fuss, he became the village chief in the end.
>
> 「すんなりと彼が村長 **になった** 」
>
> He became village chief without much difficulty.
CC BY-SA 4.0
2018-05-24T13:52:11.960
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2018-05-24T13:52:11.960
2020-06-17T08:18:27.500
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answer