adding marking on baby milk bottles

I'm using spectra bottle and the demarcation is too faint for my mother to see. Is there any way to add marking (i.e. permanent marker, etc)? I'm worried about the safety of using marker... Thanks in advance

first time mummy

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Hmm, try bottles with clear prints. I use sources ppsu bottles, they have both oz and ml markings in red, quite easy to read https://shopee.sg/product/242594539/5732034154?smtt=0.0.9

first time mummy

5y ago

Thank you. I already bought ppsu bottles. 😊

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