These bottles have only been used once or twice. We bought these silicone baby bottles because they shed less microplastic than traditional plastic bottles, however our baby is quite picky and did not like the nipples.
Only thing to be aware of is we did put her initials on the bottles... hopefully it would come off with a few dishwasher cycles.
Here is the amazon listing for more information: https://www.amazon.com/dp/B0CRMVZCD5?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1