I'll be starting solids with my DS when he's 6 months (currently 5 months and exclusively breast fed) and want to get a sippy cup for when he starts to drink water. Does "sippy cup" mean one of those ones with a hard plastic spout with little holes, that the baby tips up into his mouth? Is there such a thing as a sippy cup that is non-spill if it tips over? Can little babies suck through a straw? Keen to get the low-down!