This blog has little information to prove its credibility - there is no author, publication date, or referenced outside source to back up their claims. When I searched "amber baby teething necklace" a couple sources came up with similar information about amber's uses for inflammation and teething symptoms.
https://amber-guru.com/?srsltid=AfmBOorg7YDw9doOwMKS-raTNJwP5s259xfB9Hw8-k5wFjpO1c8apr-_
https://taylorsnaturals.com/products/balm-baby-authentic-amber-teething-necklace?srsltid=AfmBOooQPNg-dPvAICD-JcwKQ0j_mdl8hW5KVrKwwnnqvUdFhiO15E-u
However these articles aren't reliable because they are both websites selling amber necklaces, and like the Doulas of Austin article, they have no data, outside sources, or clear evidence of amber's healing properties. It's impossible to know if this information is true or if it is being construed in order to sell the product. From this search, I also found an article by thebump.com that explains the dangers of amber teething necklaces with sources to back it up. In response to the necklace's healing abilities, the article states that, "there has been no scientific evidence or research to corroborate these claims." This claim is supported by the American Academy of Pediatrics, and while the AAP's article about amber necklaces no longer exists, their home page shows that they are a reliable global organization. Thebump.com also references professional pediatricians Alexis Phillips-Walker and Dina DiMaggio. Furthermore, a quote from DiMaggio states that “amber teething necklaces are dangerous and not recommended by pediatricians."
These articles show that the claim of amber teething necklace's healing properties is most likely false because there is no evidence to back it up and it is only being promoted on websites trying to sell the product.