I am trying to introduce the boys to a sippy cup...well the Avent piece that goes with the bottles. It's great for starters. I have been putting water in them but one will drink water and the other REFUSES even though I continue to try and probably still will considering that we are big water drinkers here. I have started them on some solids but I am just wondering if 5.5 months is too early to maybe put a little juice with his water. Any other moms of 5 month olds try juices?