I say go for it. If the child can drink fine from sippy cups then I always try to transition them away from a bottle bit by bit. Once a child figures out how sippy cups work then there is no need for a bottle and sippy cups are easier to deal with at daycare and better for their teeth IMO
I had a girl start at 11 months who didn't know how to drink from the sippy and only the bottle. she would sit for 30-40 minutes just nursing a bottle and it drove me crazy. I transitioned her within a few weeks to go without the bottle and now I do water in her sippy and one sippy of milk a day.
Good luck