Teeth can become crooked.
Or even a pacifier really. At that age they're doing it more to soothe than anything else.
Breastfeeding actually helps them come in straight. :)
Quoting rfhsure: a two year old can still get accustomed to the use of a cup when they're breastfeeding. All other liquids they receive in a cup. When you're giving all of a child's liquids from a bottle they learn only to drink from there.
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