Hi, I am trying to put my 10-month-old on a sippy cup but it seems not very 'successful'. Instead of sucking, my son bites on the spout (which is made by plastic, quite soft but still a lot harder than a feeding bottle teat). He seems like treating the spout as his 'teething ring'. I have tried 3 different cups but made no difference. Any tips? Is it a sign showing that he is not ready for a sippy cup and I should wait a bit longer? Is 10 months too early to start on a sippy cup?!