I used this since Oct for my boy's milk bottle, so far so good
https://www.stickerkid.sg/sg_en/namelabels-and-clothing-labels/namelabels/stickers-belongings-labels-objets-singapore.html
bright star kids! even their cloth stickers are awesome. ironed once and washed clothes. almost 8 months already and all their stickers are still intact 👍
Paste scotch tape over the label as a protective layer?