I have some family members judging me saying my daughter should be only on a sippy cup after a year. She is 15 months...

I think part of me wants her to still be my little baby girl. So it’s hard for me to give sippy cup. Plus, she needs the milk before bed to sleep. I don’t think she will sleep without milk in the bottle. During the day she has her sippy cup, but before nap and bedtime I give a bottle...

Am I doing this wrong?