Been trying it recently, he's 4 months old and eagerly grasps the cup handles and even brings the spout into his mouth... But that's what he does to everything he can get his little hands on right now and all he wants to do is lick and gnaw on it like a teether (same issue with bottles).
Last time I tried giving it he must've swallowed about 2ml and the other 148ml was spilt everywhere! (Started using water for practice so I don't waste expressed milk!)
Any tips? Should I just keep persevering and hope he'll eventually just "get it"...?