This article from NPR explores the pros and cons of the very popular Crocs. Although the show is very easy and convenient to slip on for children, parents as well as experts are worried about the side effects for young children's developing feet. The concerns are in regards to the lack of support for the foot, which could cause heel and arch pain, foot deformities, and even hammer toes.
This article is seemingly unbiased, and is more informative rather than opinionated. According to the Ad Fontes Media Bias Chart, NPR falls right between "skews left" and "Middle or Balanced Bias", so the publisher as a whole is a good, decently unbiased source.
According to Dr. Priya Parthasarathy, whose words were used across many platforms as well as in this article, says that although they are considered "bad" for developing feet, unless your child is directly complaining about feet pain, it's not a huge issue.
From the article linked below: ""Even if they wear them all day, and they're not complaining of foot issues — no, it's not the worst thing in the world," Parthasarathy says."
https://health.wusf.usf.edu/npr-health/2024-10-08/lots-of-kids-wear-crocs-but-are-they-bad-for-young-feet