One big developmental milestone is transitioning from bottles to sippy cups. I prefer these 360-degree sippy cups over the traditional ones with the “spout” on them. The spout lets babies continue their sucking reflex instead of helping them move past this phase. The 360 sippy cups still require sucking, but it teaches kids how to start using cups without spilling milk or water everywhere.
They make versions with handles for babies and versions without handles for toddlers.