my daughter is 15 months and refuses milk from a sippy cup,( my son was the same way). She CAN drink from a sippy cup. I give her a bottle in the morning and one at night , i continually offer the sippy cup of milk and wait. When she picks her brothers cup and it's milk, she wil sip and swallow, but wont' take anymore. Eventually, she'll do it.
at 12:28 PM on Feb. 25, 2009