Bottle weaning.

So, my daughter will be 8 months on April 17th. We have finally found a sippy cup she will use at her meal times with water.

It's a straw sippy cup. I know drs. Say they need to be off bottles by 12 months, so I figured since she's got the hang of it down, why not start trying to replace her bottles with the sippy cup?

Should I start with just one bottle a day in the sippy? Or try quitting cold turkey?

She gets four 6oz bottles a day that are spaced out between 4 hours and her 3 meals.

Any tips/advice is welcomed!