Thanks Lesley, bottles are bad for this as well aren’t they? My little one doesn’t have teeth yet either 😂
I would just check on the cup. I did use a doidy cup with breast milk but it’s an open cup and you would still have to hold it for them. You could maybe try a straw cup or ask your HV for recommendations if you can’t find anything online.
You can change at any time but I would do a bit of research on the cup your using encase it causes tooth decay.