We are getting ready to start solids/introduce a sippy cup. Do I just put water in the sippy and not breastmilk? LO only gets a bottle 3x a week when I'm gone. I'm worried he will get used to the faster flow of the sippy if I put breastmilk in it.

Also my MIL told me I need to wean him from the bottle at 6 months. Which I think is ridiculous, but she didn't breastfeed past 6 months so I'm guessing she just put formula in a sippy instead of a bottle?