My twin boys are 15 months and still drinking from bottles. My hv is cross with me for not using cups, but in spite of constant trying they take a couple of sips then just up-end the cups and splash about in the puddle with their hands. I don't mind this, except it means the only way I can get liquid down is by bottle. I don't really want to deny them liquid unless by cup. One of the boys drinks better than the other, but they always copy each other so each session ends up the same way. I get frustrated and take the cups away which ends in tears from both.