I've read that it helps to stop offering them as much as possible and be ready to give replacements in case they ask, like a snack or a drink. Distraction may also do. You can check this link for further read http://sleeplady.com/parenting/7-tips-to-gently-wean-your-breastfeeding-toddler/
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You might just want to substitute breastmilk with formula. Offer it in the most breast-like bottle you can ever find, if there is such.