At what age did you give chocolate drink to your baby?

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My 1-year old baby is envious of her sister who drink chocolate-milk in the morning. She would really try to grab her sister's milk and refuse to have her own bottle of milk. There are available choco flavored milk for 1+ toddlers but I am afraid she might refuse plain milk if I ever giver chocolate this early. Is it ok giving her chocolate flavored milk?