For Mommas who have weaned bottle fed babies.

What, in your experience, is best to wean first, the bottle or the formula (or breast milk)? I know he should not have cow's milk until 1 year and he's eating plenty of souls foods. What l wonder is should I start his bottle weaning first (give him formula in sippy cups)? Or should I get him weaned from formula first (give him milk in a bottle)?

I know all babies and families are different but I'm wondering what worked for other people.