The following tip comes from Shelby, mother of adorable boy-girl twins and owner of Double Up Books:

Pick a bottle color or sippy color that you designate to each twin that way you’ll always know whose drink that is, who doesn’t finish their drink, and who is drinking out of the wrong cup. For example, my son always has orange, blue or green cups and my daughter always has red, purple, and pink cups.

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Khanh-Van Le-Bucklin