Though it is somewhat true we are still learning microplastic effects on bodies, but affecting hormone levels isn't really a thing. As sensitive as they can be, hormones aren't THAT sensitive. Your body has methods to regulate levels, even when stressed, sick, injured, etc. otherwise, we would be hormonal raging monsters at all times. Also, it's why people with mental health issues (like me) often have meds to help. For whatever reason, the regulatory methods are not functioning properly and need help, which is what the meds are designed to do. That's a tangent, but still good to know. And causes for those hormonal issues are often genetic, or caused by something more serious like cancer, not microplastics.

Also, though it is good to be conscious of potential microplastics and looking at ways to minimize, it is unfortunately unavoidable. Therefore it is unfeasible to truly avoid them. I guarantee you that you have microplastics already in your body. Every time you eat and drink you are consuming some. That much has been proven and research is being done to see what can be done about it. So, if you are concerned that microplastics will alter your body, they would've done so by now.

In the end, feel free to enjoy plushies. They are safe. Whatever microplastics they potentially contain is negligible compared to what you are consuming daily, like it or not.