My son made the switch to sippy cup quite well. We slowly switched him. Now he only gets a bottle at night. However for the past 5-6 days when he drinks his sippy he makes a mess. Has milk all over his face. I haven't switched the type of sippy and he never had this problem before. Did any one else have this problem? He is teething could it just be the extra drool (he is like a baby St. Bernard right now). Should I try a different type of sippy? Tips or suggestions please

thanks!
Re: Sippy issues
Married DH 7/30/11
CSC arrived 5/7/12
CHC arrived 6/2/14